Data Analysis of Journal
This research aims at describing the result of the readability level of English reading texts tested by using Fog Index (FI) for testing English in Mind textbook second edition by Cambridge University Press. The data in this research came from analyzing the texts from the English textbook and the scores of the readability test were administered by using Fog Index (FI). The research findings are described based on each text and the texts in general. The results of the readability level analysis by FI from the thirty eight texts showed different grade levels. Table 4.1 below shows the overall grade level of the ninteen texts and the mean grade level of those texts according to FI.

Table 4.1
Summary of Readibility Grade Level based on FOG Index (FI)

Text	Page	Total Words	Total Sentence	Total Polysilabic 	FOG	Category	
1	4	284	34	17	6	Easy	
2	10	316	19	24	10	Easy	
3	12	390	22	24	10	Easy	
4	16	370	19	36	12	Moderate	
5	17	172	12	15	9	Easy	
6	18	200	17	8	6	Easy	
7	20	158	14	8	7	Easy	
8	24	113	13	10	7	Easy	
9	26	319	20	16	8	Easy	
10	30	501	40	39	8	Easy	
11	31	273	16	26	11	Moderate	
12	37	126	6	14	13	Moderate	
13	38	215	13	32	13	Moderate	
14	40	373	21	45	12	Moderate	
15	44	404	19	37	12	Moderate	
16	52	222	14	26	11	Moderate	
17	54	435	30	32	9	Easy	
18	58	498	47	26	6	Easy	
19	59	220	13	22	11	Moderate	
20	65	134	7	11	11	Moderate	
21	66	161	9	10	10	Easy	
22	68	252	15	18	10	Easy	
23	72	404	21	46	12	Moderate	
24	73	293	17	22	10	Easy	
25	74	430	28	31	9	Easy	
26	77	205	14	23	10	Easy	
27	78	451	45	18	6	Easy	
28	80	196	16	8	7	Easy	
29	82	631	47	26	7	Easy	
30	87	219	14	16	9	Easy	
31	89	108	9	3	6	Easy	
32	94	307	22	15	8	Easy	
33	93	125	9	12	9	Easy	
34	96	406	20	28	11	Moderate	
35	100	196	11	16	10	Easy	
36	101	215	11	20	12	Moderate	
37	102	517	32	52	10	Easy	
38	106	444	44	16	5	Easy	

Table 4.1 revealed that there were 38 texts consisted in the English in mind textbook second edition. Based on FOG Gunning Index result, it was found that there were twelve texts categorized as moderate readability which have FOG index 11, 12, and 13. However, rest of them were classified as easy readability since the FOG Index ≤ 10. The description of FOG Index result of each text is explained as follows. 
4.1.1   Readability Text based on FOG Gunning Index
	There were thirty eight texts that were analyzed in this research. The analysis was done based on FOG Index (FI) test. The analysis will be described below. 
1). Text 1: September 12th
The text was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The first text which was entitled “September 12th” had the value of FOG Index (FI) was 5.73. The calculation of text 1 can be seen below. 
FI	= ( (284/34) + 100 (17/284) ) x 0,4 
= (8,35 + 5, 98) x 0,4
= 14,33 x 0,4 
= 5,73
Since the FOG Index (FI) of text 1 was 5.73, it belongs to easy category for the students. It means that based on FOG Index (FI), text 1: An September 12th was easy to be understood by senior high school students. 
2). Text 2: It’s Legal but is it Right? 
After analzying text 2 FI formula, the researcher found that there are 19 sentences and 316 words. The text 2 had the value of FOG Index (FI)= 9.68. The calculation of text 2 can be seen below. 
FI	= ( (316/19) + 100 (24/316) ) x 0,4 
= (16,63 + 7, 59) x 0,4
= 24,22 x 0,4 
= 9,68
The FOG Index (FI) of text 2 was 9.68 which belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 2: it s legeal but is it right was easy.  
3). Text 3: Talking Without Speaking
The text 3 was analyzed using FOG Index (FI) to know the readability of the text. The third text which was entitled “Talking without Speaking” had the value of FOG Index (FI)= 9.54. The calculation of text 3 can be seen below. 
FI	= ( (390/22) + 100 (24/390) ) x 0,4
= (17,72 + 6,15) x 0,4
= 23,87 x 0,4 
= 9,54
Since the FOG Index (FI) of text 3 was 9.54, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 3: talking without speaking was easy to be comprehend by senior high school students. 
4). Text 4: Talk to the Animals 
After analzying text 4 FI formula, the researcher found that there are 36 sentences and 370 words. The text 4 had the value of FOG Index (FI)= 11.67. The calculation of text 4 can be seen below. 
FI	= ( (370/19) + 100 (36/370) ) x 0,4
= (19,47 + 9,72) x 0,4
= 29,19 x 0,4
= 11,67
The FOG Index (FI) of text 4 was 11.67 which belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 4: talk to the animals was on moderate category.
5). Text 5: My Friend Rebecca
The text 5 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The fifth text which was entitled “My Friend Rebecca” had the value of FOG Index (FI)=9.22. The calculation of text 5 can be seen below. 
FI	= ( (172/12) + 100 ( 15/172) ) x 0,4
= (14,33 + 8,72) x 0,4
= 23,05 x 0,4
= 9.22
Since the FOG Index (FI) of text 5 was 9.22, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 5: My Friend Rebecca was easy to be comprehend by senior high school students. 
6). Text 6: Elert the Faithful Dog 
After analyzing text 6 FI formula, the researcher found that there are 17 sentences and 200 words. The text 6 had the value of FOG Index (FI)= 6.30. The calculation of text 6 can be seen below. 
FI	= ( (200/17) + 100 ( 8/200) ) x 0,4 
= (11,76 + 4) x 0,4
= 15,26 x 0,4 
= 6,30
The FOG Index (FI) of text 6 was 6.30 which belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 6: Elert the Faithful Dog was on easy category. 
7). Text 7: A prince Liewellyn
The text 7 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The seventh text which was entitled “A Prince Liewellyn” had the value of FOG Index (FI)=6.53. The calculation of text 7 can be seen below. 
FI	= ( (158/14) + 100 ( 8/158) ) x 0,4 
= (11,28 + 5,06) x 0,4
= 16,34 x 0,4
= 6,53
The FOG Index (FI) of text 7 was 6.53 which belongs to easy category for senior high school students. It means that based on FOG Index (FI), A Prince Liewellyn was on easy category. 
8). Text 8: Adam & Jessica Meet
The text 8 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The eighth text which was entitled “Adam & Jessica Meet” had the value of FOG Index (FI)=7.02. The calculation of text 8 can be seen below. 
FI	=  ( (113/13) + 100 (10/113) x 0,4
= (8,69 + 8,84) x 0,4
= 17,53 x 0,4
= 7,02
The FOG Index (FI) of text 7 was 7.02 which belongs to easy category for senior high school students. It means that based on FOG Index (FI), Adam & Jessica Meet was on easy category. 
9)Text 9:  A Working Life
The text 9 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The ninth text which was entitled “A Working Life” had the value of FOG Index (FI)=8.38. The calculation of text 9 can be seen below. 
FI	= ( (319/20) + 100 (16/319) ) X 0,4
= (15,95 + 5,01) x 0,4
= 20,96 x 0,4
= 8,38
Since the FOG Index (FI) of text 9 was 8.38, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 9 was easy to be comprehend by senior high school students. 
10). Text 10: Fiction in Mind 
After analzying text 10 FI formula, the researcher found that there are 40 sentences and 501 words. The text 10 had the value of FOG Index (FI)= 8.12. The calculation of text 10 can be seen below. 
FI	= ( (501/40)+ 100 (39/501) x 0,4
= (12,52 + 7,78) x 0,4
= 20,3 x 0,4
= 8,12
The FOG Index (FI) of text 10 was 8.12 which belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 10 was on easy category. 
11). Text 11: Letter
The text 11 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The eleventh text which was entitled “ Letter” had the value of FOG Index (FI)=10.63. The calculation of text 11 can be seen below. 
FI	= ( (273/16) + 100 (26/273) ) x 0,4
= (17,06 + 9,52) x 0,4
= 26,58 x0,4
= 10,63
Since the FOG Index (FI) of text 11 was 10.63, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 11 was moderate to be comprehend by senior high school students. 
12). Text 12: Did You Know?
The text 12 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The twelfth text which was entitled “Did You Know” had the value of FOG Index (FI)=12.84. The calculation of text 12 can be seen below. 
FI	= ( ( 126/6) + 100  (14/126) ) x 0,4
= (21 + 11,11) x 0,4
= 32,11 x 0,4
= 12,84
Since the FOG Index (FI) of text 9 was 12.84, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 9 was moderate to be comprehend by senior high school students. 
13). Text 13: Will computer ever be more intelligent than people?
The text 13 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “Will computer ever be more intelligent than people?” had the value of FOG Index (FI)=12.56. The calculation of text 12 can be seen below. 
FI 	= ( (215/13) + 100 (32/215) x 0,4
= (16,53 + 14,88) x 0,4
= 31,41 x 0,4
= 12,56
Since the FOG Index (FI) of text 13 was 12.56, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 13 was moderate to be comprehend by senior high school students. 
14). Text 14: Ever Fancied being on TV?
After analzying text 14 FI formula, the researcher found that there are 21 sentences and 373 words. The text 10 had the value of FOG Index (FI)= 11.92. The calculation of text 14 can be seen below. 
FI	= ( ( 373/21) + 100 ( 45/373) x 0,4
= (17,76 + 12,06) x 0,4
= 29,82 x 0,4
= 11,92
The FOG Index (FI) of text 14 was 11.92 which belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 14 was on moderate category. 

15). Text 15: Culture in Mind
The text 15 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The fifteenth text which was entitled “Culture in Mind” had the value of FOG Index (FI)=12.16. The calculation of text 15 can be seen below. 
FI	= ( ( 404/19) + 100 (37/404) ) x 0,4
= (21,26 + 9,15) x 0,4
= 30,41 x 0,4
= 12,16
Since the FOG Index (FI) of text 15 was 12.16, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 15: Culture in Mind was moderate to be comprehend by senior high school students. 
16). Text 16: Dear Sir
The text 16 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The sixteenth text which was entitled “Dear Sir” had the value of FOG Index (FI)=11.02. The calculation of text 16 can be seen below. 
FI	= ( ( 222/14) + 100 (26/222) ) x 0,4
= (15,85 + 11,71) x 0,4
= 27,56 x 0,4
= 11,02
Since the FOG Index (FI) of text 11 was 12.02, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 16: Dear Sir was moderate to be comprehend by senior high school students. 
17). Text 17: Good and Evil 
After analzying text 17 FI formula, the researcher found that there are 30 sentences and 435 words. The text 17 had the value of FOG Index (FI)= 8.74. The calculation of text 17 can be seen below. 
FI	= ( (435/30) + 100 ( 32/435) ) x 0,4
= (14,5 + 7,35) x 0,4
= 21,85 x 0,4
= 8,74
The FOG Index (FI) of text 17 was 8.74 which belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 17: good and evil was on easy category. 
18). Text 18: Fiction in Mind
The text 18 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The eightenth text which was entitled “Fiction in Mind” had the value of FOG Index (FI)=6.32. The calculation of text 18 can be seen below. 
FI	= ( ( 498/47) + 100 ( 26/498) x 0,4
= (10,59 + 5,22) x 0,4
= 15,81 x 0,4
= 6, 32
Since the FOG Index (FI) of text 18 was 6.32, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 18: Fiction in Mind was easy to be comprehend by senior high school students. 
19). Text 19: What are the advantages and disadvantages?
The text 19 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The ninteenth text which was entitled “What are the advantages and disadvantages? ” had the value of FOG Index (FI)= 10.76. The calculation of text 19 can be seen below. 
FI	= ( (220/13) + 100 (22/220) ) x 0,4
= (16,92 + 10) x 0,4
= 26,92 x 0,4
= 10,76
Since the FOG Index (FI) of text 19 was 10.76, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 19: What are the advantages and disadvantages? was moderate to be comprehend by senior high school students. 
20). Text 20: Did You Know? 
The text 20 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The twentieth text which was entitled “Did You Know? ” had the value of FOG Index (FI)= 10.93. The calculation of text 20 can be seen below. 
FI	= ( ( 134/7) + 100 ( 11/134) x 0,4 
= (19,14 + 8, 20) x 0,4
= 27,34 x 0,4
= 10,93
Since the FOG Index (FI) of text 20 was 10.93, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 20: Did You know? was moderate to be comprehend by senior high school students. 
21). Text 21: Today’s Discussion
The text 21 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The twenty first text which was entitled “Today’s Discussion ” had the value of FOG Index (FI)= 8.03. The calculation of text 21 can be seen below. 
FI	= ( (161/9) + 100 (10/161) ) x 0,4
= (17,88 + 6, 21) x 0,4
= 20,09 x 0,4
= 8,03
Since the FOG Index (FI) of text 21 was 8.03, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 21: Today’s Discussion was easy to be comprehend by senior high school students. 
22). Text 22: The Truth is Out There
The text 22 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “The truth is out there ” had the value of FOG Index (FI)= 9.57. The calculation of text 22 can be seen below. 
FI	= ( (252/15) + 100 ( 18/252) ) x 0,4
= (16,8 + 7,14) x 0,4
= 23,94 x 0,4
= 9,57
Since the FOG Index (FI) of text 22 was 9.57, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 22: The truth is out there was easy to be comprehend by senior high school students. 
23). Text 23: Do they exist?
The text 23 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “do they exist?” had the value of FOG Index (FI)=12.24. The calculation of text 23 can be seen below. 
FI	= ( ( 404/21) + 100 ( 46/404) ) x 0,4
= (19,25 + 11,38) x 0,4
= 30,62 x 0,4
= 12,24
Since the FOG Index (FI) of text 23 was 12.24, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 24: do they exist? was moderate to be comprehend by senior high school students. 
24). Text 24: The Lake
The text 24 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “the Lake” had the value of FOG Index (FI)=9.89. The calculation of text 24 can be seen below. 
FI	= ( ( 293/17) + 100 ( 22/293) ) x 0,4
= (17,23 + 7,50) x 0,4
= 24,73 x 0,4
= 9,89
Since the FOG Index (FI) of text 24 was 9.89 it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 24: the lake was easy to be comprehend by senior high school students. 
25). Text 25: Mysterious Stones 
After analzying text 25 FI formula, the researcher found that there are 28 sentences and 430 words. The text 25 had the value of FOG Index (FI)= 9.02. The calculation of text 25 can be seen below. 
FI	= ( ( 430/28) + 100 (31/430) ) x 0,4
= (15,35 + 7,20) x 0,4
= 22,55 x 0,4
= 9,02
The FOG Index (FI) of text 25 was 9.02 which belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 25: mysterious stones was on easy category. 
26). Text 26: The Curse of Tutankhamen's Tomb
The text 26 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “The Curse of Tutankhamen's Tomb” had the value of FOG Index (FI)=10.34. The calculation of text 26 can be seen below. 
FI	= ( (205/14) + 100 ( 23/205) ) x 0,4
= (14,64 + 11,21) x 0,4
=25,85 x 0,4
= 10,34
Since the FOG Index (FI) of text 26 was 10.34 it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 26: The Curse of Tutankhamen's Tomb was easy to be comprehend by senior high school students. 
27). Text 27: What do they do in there?
The text 27 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “what do they do in there?” had the value of FOG Index (FI)=5.68. The calculation of text 27 can be seen below. 
FI	= ( (451/45) + 100 ( 18/451) x 0,4
= (10,02 +3.99) x 0,4
= 14,01 x 0,4 
= 5, 68
Since the FOG Index (FI) of text 17 was 5.68, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 27: what do they do in there? was easy to be comprehend by senior high school students. 
28). Text 28: I Was Standing 
The text 28 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “I was standing” had the value of FOG Index (FI)=6.53. The calculation of text 28 can be seen below. 
FI	= ( (196/16) + 100 (8/196) ) x 0,4
= (12,25 + 4,05) x 0,4
= 16,33 x 0,4
= 6,53
Since the FOG Index (FI) of text 17 was 6.53, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 28: I was standing was easy to be comprehend by senior high school students. 
29). Text 29: A Service of Love 
After analzying text 29 FI formula, the researcher found that there are 47 sentences and 631 words. The text 29 had the value of FOG Index (FI)= 7.01. The calculation of text 29 can be seen below. 
FI	= ( (631/47) + 100 (26/631) ) x 0,4
= (13.42 + 4,12) x 0,4
= 17,54 x 0,4
= 7,01
The FOG Index (FI) of text 29 was 7.01 which belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 29: a service of love was on easy category. 
30). Text 30: The Person 
The text 30 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “the person” had the value of FOG Index (FI)=9.17. The calculation of text 30 can be seen below. 
FI	= ( (219/14) + 100 (16/219) x 0,4 
= (15,64 + 7,30) x 0,4
= 22,94 x 0,4 
= 9,17
Since the FOG Index (FI) of text 30 was 9.17, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 30: the person was easy to be comprehend by senior high school students. 
31). Text 31: My Angry Family 
The text 31 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “my angry family” had the value of FOG Index (FI)=5.90. The calculation of text 31 can be seen below. 
FI	= ( ( 108/9) + 100 ( 3/108) ) x 0,4
= (12 + 2,77) x 0,4 
= 14,77 x 0,4
= 5,90
Since the FOG Index (FI) of text 31 was 5.90, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 31: my angry family was easy to be comprehend by senior high school students. 
32). Text 32: A Few Years Ago 
The text 32 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “a few years ago” had the value of FOG Index (FI)=7.53. The calculation of text 32 can be seen below. 
FI	= ( (307/22) + 100 (15/307) ) x 0,4
= (13,95 + 4,88) x 0,4
= 18.83 x 0,4
= 7,53
Since the FOG Index (FI) of text 32 was 7.53, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 32: a few years ago was easy to be comprehend by senior high school students. 
33). Text 33: Did You Know 
The text 33 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “did you know” had the value of FOG Index (FI)=9.39. The calculation of text 33 can be seen below. 
FI	= ( ( 125/9) + 100 (12/125) ) x 0,4
= (13,88 + 9,6) x 0,4
= 23,48 x 0,4
= 9,39
Since the FOG Index (FI) of text 33 was 9.39, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 33: did you know was easy to be comprehend by senior high school students. 
34). Text 34: What are you afraid of? 
The text 34 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “what are you afraid of?” had the value of FOG Index (FI)=10.88. The calculation of text 34 can be seen below. 
FI	= ( (406/20) + 100 ( 28/406) x 0,4 
= (20,3 + 6,89) x 0,4
= 27,19 x 0,4 
= 10,88
Since the FOG Index (FI) of text 34 was 10.88, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 34: what are you afraid? was moderate to be comprehend by senior high school students. 
35). Text 35: The Legend Of 
The text 35 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “the legend of” had the value of FOG Index (FI)=10.34. The calculation of text 35 can be seen below. 
FI	= ( (196/11) + 100 (16/196) ) x 0,4
= (17,81 + 8,16) x 0,4
= 25,97 x 0,4
= 10,34
Since the FOG Index (FI) of text 35 was 10.34, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 35: the legend of  was easy to be comprehend by senior high school students. 
36). Text 36: One of the Scariest 
The text 36 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “one of the scariest” had the value of FOG Index (FI)=11.53. The calculation of text 36 can be seen below. 
FI	= ( (215/11) + 100 (20/215) ) x 0,4
= (19,54 + 9,30) x 0,4
= 28,84 x 0,4
= 11,53
Since the FOG Index (FI) of text 36 was 11.53, it belongs to moderate category for senior high school students. It means that based on FOG Index (FI), text 36: one of the scariest was moderate to be comprehend by senior high school students. 
37). Text 37: Happiness 
The text 37 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The next text which was entitled “mhappiness” had the value of FOG Index (FI)=10.48. The calculation of text 37 can be seen below. 
FI	= ( (517/32) + 100 (52/517) ) x 0,4
= (16,15 + 10,05) x 0,4
= 26,2 x 0,4 
= 10,48
Since the FOG Index (FI) of text 37 was 10.48, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 37: happiness was easy to be comprehend by senior high school students. 
38). Text 38: A Tough Decision
The text 38 was analyzed using FOG Index (FI) to know the readability of the texts at grade XI students. The last text which was entitled “A Tough Decision” had the value of FOG Index (FI)=5.47. The calculation of text 19 can be seen below. 
FI	= ( (444/44) + 100 ( 16/444) ) x 0,4
= (10,09 + 3,60) x 0,4
= 13,69 x 0,4 
= 5,47
Since the FOG Index (FI) of text 38 was 5.47, it belongs to easy category for senior high school students. It means that based on FOG Index (FI), text 38: a tough decision was easy to be comprehend by senior high school students. Moreover the percentage of text which are in moderate and easy level can be seen in the following table. 

Table 4.2 The Percentage Level of Readability
No	Level of Readability	Total Text	
		F	%	
1	Easy	26	68%	
2	Moderate	12	32%	
3	Difficult	0	0	
	Total	38	100%	

	Table 4.2 showed that there were 26 texts or 68% which categorized as easy level of readability, there were 12 or 32% of text as moderate level of readability based on Gunning Fog formula. However, there was no difficult level of readability found in the textbook. It can be concluded that dominantly texts consisted in the English in Mind second edition textbook by Cambridge University textbook  had easy readability with percentage 68%.