Percent Change
Percent
ax + b = cx + d
ax + b < cx + d
miscellaneous
100

Find the percent change 

From 200 to 500

150% change 

100

20 is what percent of 50?

40%

100

9x − 10 = 3x + 2

x = 2

100

7x - 3 < 2x + 8

x < 2.2 

100

10% of 90 =

9

200

Find the percent change from

32 to 8

75% decrease

200

42 is what percent of 350?

12%

200

−5y − 3 = 2y + 18    

y = -3

200

11x + 2 > 8x - 5

x > -7/3 

200

-5x + 10 = 5x + 15

x = -1/2

300

The price of a pair of shoes increases from $20 to $32. Find the percent increase. 

60%

300

60 is what percent of 400?

15%

300

−10a + 4 = −a − 14    

a = 2

300

5x + 2 < 2x + 20

x < 3
300

8y = 3y + 20

y = 4

400

The price of gasoline rose from $2.40 to 2.78 in one month. By what percent did the gas price raise? 

15%

400

here are 48 employees in a company. On a certain day, 36 were present. What percent showed up for work? _____%

75%

400

6x − 1 = 2x + 2    

x = 3/4

400

2(k-3) > 6 + 3k - 3

k < -9

400

n - 2 = -3n + 6

n = 2

500

A shirt was originally priced at $48. It went on sale for $38.40. What was the percent the shirt was discounted?

20%

500

he Royals softball team played 75 games and won 60 of them. What percent of the games did they lose? _____%

20%

500

10y − 3 = 3y − 1

y = 2/7

500

3 + 5x > 6x - 2x 

x > 3

500

6x + 2 = x+ 17

x = 3