To review these concepts, go to Solving Percent Problems Study Guide.
Solving Percent Problems Practice Questions
Practice
Use the shortcut to calculate a 15% tip and a 20% tip for each bill, rounding to the nearest nickel.
 $20
 $25
 $32.50
 $48.64
 $87.69
 $234.56
Find the percent of change. If the percentage doesn't come out evenly, round to the nearest tenth of a percent.
 From $5 to $10
 From $10 to $5
 From $40 to $50
 From $50 to $40
 From $25 to $35.50
 A population decrease from 8.2 million people to 7.4 million people
 From 15 miles per gallon to 27 miles per gallon
 From a police force of 120 officers to 150 officers
Percent Word Problems
Use the direct approach to solve these word problems. If you are unfamiliar with word problems or just need brushing up on how to solve them, consult Lessons 15 and 16 for extra help.

A $180 suit is discounted 15%.What is the sale price?
a. $27
b. $153
c. $165
d. $175
e. $207

Ron started the day with $150 in his wallet. He spent 9% of it to buy breakfast, 21% to buy lunch, and 30% to buy dinner. If he didn't spend any other money that day, how much money did he have left at the end of the day?
a. $100
b. $90
c. $75
d. $60
e. $40

Jacob invested $20,000 in a new company that paid 10% interest per year on his investment. He did not withdraw the first year's interest, but allowed it to accumulate with his investment. However, after the second year, Jacob withdrew all his money (original investment plus accumulated interest). How much money did he withdraw in total?
a. $24,200
b. $24,000
c. $22,220
d. $22,200
e. $22,000

If Sue sleeps six hours every night, what percentage of her day is spent sleeping?
a. 6%
b. 20%
c. 25%
d. 40%
e. 60%

Linda purchased $500 worth of stocks on Monday. On Thursday, she sold her stocks for $600. What percent does her profit represent of her original investment, excluding commissions?(Hint: profit = selling price – purchase price)
a. 100%
b. 20%
c.
d.
e.

The Compuchip Corporation laid off 20% of its 5,000 employees last month. How many employees were NOT laid off?
a. 4,900
b. 4,000
c. 3,000
d. 1,000
e. 100

A certain credit card company charges interest per month on the unpaid balance. If Joni has an unpaid balance of $300, how much interest will she be charged for one month?
a. 45 ¢
b. $3
c. $4.50
d. $30
e. $45

A certain credit card company charges interest per month on the unpaid balance. If Joni has an unpaid balance of $300 and doesn't pay her bill for two months, how much interest will she be charged for the second month?
a. $4.50
b. $4.57
c. $6
d. $9
e. $9.07
Solutions
 $3, $4
 $3.75, $5
 $4.90, $6.50
 $7.30, $9.75
 $13.15, $17.55
 $35.20, $46.90
 100% increase
 50% decrease
 25% increase
 20% decrease
 42% increase
 9.8% decrease
 80% increase
 25% increase
 b.
 d.
 a.
 c.
 b.
 b.
 c.
 b.
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