1. Proportions and Percent Equations
ALGEBRA 1 LESSON 4-3
pages 200–202  Exercises
1. 50%
2. 25% %
4. 20%
5. 25%
6. 20%
7. 8
8. 16
9. 21
10. 28
11. 10
12. 20
13. = , 50
14. = , 25
15. = , 160
16. = , 240
17. = , 70
18. = , 140 h
= 0.25x; 200
= 0.50x; 50
= n • 150; 64% 40
100 80 15 20 60 30 x 24 48 42
= n • 60; 75%
24. x = 0.05(300); 15
25. x = 0.05(200); 10
26. 21 %
28. 4 % %
34. 22 1 3
4-3

2. Proportions and Percent Equations
ALGEBRA 1 LESSON 4-3
36. 68
37. 32
38. about 960 students
39–40.  Proportions or equations may
vary. Samples are given.
= , 4
= , 400%
41. x = 0.002(900), 1.8
x = 1.8, 90
x = 988, 98.8%
(84) = x, 117.6 75
100 3 x
300
45. 62; 50% is 61 and 51.3% > 50%.
46. 20; 25% is 21 and 23.9% < 25%.
47. 73; 10% is 74 and 9.79% < 10%.
; 75% is 180 and 76.02% > 75%.
49. $297.00
50. $32.70
51. $
52. Answers may vary. Sample: $1.20;
take 10% and 5% of $8 and add them.
53. a. $74.25
b. 3.75%
c. 6 yr
54. $61.20
55. $
56. 7%
57. 2 yr
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3. Proportions and Percent Equations
ALGEBRA 1 LESSON 4-3
58. Answers may vary. Sample: 33%;
I sleep 8 h a day, and there are
24 h in a day, so = , x =
59. a.
b. 200
c. 400%
60. Yes; 16.99(1.15)(0.66) < 13.99(1.06),
12.90 <
64. 35 x
100 8 24 1 3 50
66. 20 mi mi mi mi
71. b < –4;  
72. x 7;  
73. h > –21;  
74. p < – ;   1 3 2 3
> – 1 3
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