Name
KEY
Period ______
Proportions and Percents Exam Review ANSWERS
Question
Proportion
Answer
1. Mrs. Torres planted 30
strawberry plants in her garden
in April. By the end of June,
20% of the plants were
infested with bugs. How many
plants were NOT infested with
bugs?
2. Yan’s manicure cost
$25.90. She wants to leave a
15% tip. Which of the
following is closest to the
amount of the tip she wants to
leave?
3. Sue made a batch of snack
mix for the party. She
combined 12 ounces of mixed
nuts, 20 ounces of cereal, and
8 ounces of pretzels. What
percent of the snack mix are
pretzels?
x
80

30 100
D 24
x
15

25.90 100
C $4.00
8
x

40 100
C 20%
30.60
x

390.60 100
A 7.8%
4. Mr. Wilson bought 4 tires
for $390.60. If each tire cost
$90 before tax was added,
what tax rate did he pay on the
tires?
5. Greg earns a salary of $300
per week plus an additional
6% commission on his sales. If
his weekly salary increases by
$50 and his commission
increases to 7%, how much
will Greg earn if his weekly
sales are $4,000?
6. Marcie saved $21.60 when
she purchased a sweater on
sale. If the sale price was 60%
off the regular price, what was
the regular price of the
sweater?
x
7

4000 100
D $630
280  350  630
21.60 60

x
100
C $36.00
7. Julianne went to a hair
salon for a haircut. The cost of
the haircut was $45. If she
tipped the stylist 15% of the
cost of the haircut, how much
money did Julianne spend at
the hair salon?
x
15

45 100
6.75  45  51.75
8. Daryl saved $25 when he
purchased a pair of tennis
shoes on sale. If the sale price
was 35% off the regular price,
what was the regular price of
the tennis shoes?
25 35

x 100
9. Which of the following
represents the greatest percent of
change?
152  76
1
76
A A calf that weighed 76 pounds
at birth now weighs 152 pounds.
250  225
 0.1111
225
B A person whose commission
was $225 last week earned a
commission of $250 this week.
C A basketball player who
played for 20 minutes in the first
game played for 15 minutes in
the last game.
D A runner who ran 12 miles
each day last month now runs 16
miles each day.
10. Mira read 55 books last year
and wrote reports on 47 of them.
Which best represents the percent
of books Mira read that she did
NOT write reports on?
A $71.43
A A calf that weighed 76 pounds
at birth now weighs 152 pounds.
15  20
 0.25
20
16  12
 0.3333
12
8
x

55 100
D 15%
Journal: Bolda Cola sells at 5 for $3. How much would it cost to purchase 27 cans of Bolda Cola? Write four
different proportions for the problem above. Show that the answer to the problem is the same no matter
which proportion you use. Explain the procedures you would use to solve the proportions you wrote. Pick one
proportion and solve it.
BC 5 27 BC

$ 3 x $
x  $16.20
$ 3 x $

BC 5 27 BC
x  $16.20
$ 3 5 BC

$ x 27 BC
x  $16.20
BC 27 x $

BC 5 3 $
x  $16.20
Students should be able to write 4 different proportions comparing each of the different ratios. Students
will need to solve each of the 4 proportions, showing their work and scale factor. By solving each
proportional equation, students will prove the answer to each problem is the same. Students then will pick
one of the proportional equations and provide a detailed explanation (in words) of how they solved the
problem.