DATE
Practice
Percent of Change
PERIOD
-
State whether each percent of change is a percent of increase or a percent of
Then find each percent of change. Round to the nearest whole percent.
d.ecrease.
1.
original: 18
new:10
2. original: 140
decrease;44o/"
4. original: 10
increase;
new:320
increase; 147"
increase;600/o
5. original: 76
new:25
3. original: 200
new:160
6. original: 128
new:60
15Ao/o
7. original: 15
new: 120
decrease;21o/o
8. original:98.6
decrease;67"
9. original: 58.8
new:35.5
new: 64
new:65.7
increase;137%
decrease;35o/o
increase;
127o
Find the total price of each item.
10. concrete blocks: $95.00
tax:.67o
$100.70
13. class ring: $325.00
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12.jacket: $fZf.OO
tax:.5.5Vo
$255.60
$131.88
14. blanket: $z+.gg
tax:6Vo
tax:77o
$344.50
$26.74
15.
kite: $18.90
tax:5%
$19.85
Find the discounted priee of each item.
cq
E
11. crib: $z+O.OO
taxl.6.57a
16.
dry cleaning: $25.00
discount: l-57o
$21.25
19. stationery: $1Z.gS
discount: 107o
$11.66
$+S.gg
discortnt:25%o
17. computer game:
18.luggage: $185.00
discount:30%
$37.4e
$129.50
20, prescription glasses: $149 21. pair of shorts: $24.99
discount:207o
discount:45Vo
$119.20
$13.74
F'ind the final price of each itern.
22. television: $375.00
discount:257o
tax:67o
29. DVD player: $Z0g.OO
24. printer: $ZS5.OO
discolurrt:.207o
discount: 307o
tax:.7Vo
tax:-5-57o
$188.32
$298.13
$230.26
2S.INVESTMENTS The price per share of a stock decreased from $90 per share to $36 per
share. By what percent did the price of the stock decrease? 607o
26. HEATING COSTS Customers of a utility company received notices in their monthly
bills that heating costs for the average customer had increased l25Vo over last year
because of an unusually severe winter. In January of last year, the Garcia's paid $120
for heating, What should they expect to pay this January if their bill increased by 1257o?
$270
Chapter 2
45
Glencoe Algebra
1
DATE
2-7
PERIOD
Word Problem Prattite
Percent of Change
5. MUSIC The table below shows the total
number of CDs, downloaded singles, and
music videos sold in 2004,2006, and 2008.
girls'fast pitch
softball diamond has bases that are
60 feet apart. A regulation professional
baseball diamond has bases that are 50Vo
farther apart. Label the distance
between the bases on the regulation
baseball diamond diagram.
1. SPORTS A regulation
Sales of Recorded Music and Music Videos
(millions of units)
Format
2AO4
2006
2008
CD
767.0
614.9
368.4
Downloaded
139.4
586.4
1042.7
Video
32.8
23.1
20.8
Souice:
Recording lndusby Association of America
a. Find the percent
of change in the
number of units sold between2004
and 2006 and between 2006 and 2008
for each format. Round your answers
to the nearest tenth.
19.8Y";4A.1o/o
CD
Downloaded
Video
2.SALES TAX Olivia purchases a DVD
movie priced at $21.99. The sales tax is
6.57o.What is the total price of the
movie, inciuding tax?
b. Tell whether
320,60/o177.84/o
29.60/o;10.0%
o
E
each percent of change
:.
=
in part a is a percent ofincrease or a
percent ofdecrease.
$23.42
o
d
a
decrease; decrease
Downloaded increase; increase
DVD video increase; increase
CD
3. EDUCATION The ACT is a college
entrance exam taken hy high school
students. The maximum score that can
be earned is 36. The average score in the
United States was 21.2 during a recent
year. The average score for Vermont
students that year was 7.\Vo higher than
the national average. What was the
average ACT score for Vermont students?
o
o
s
{
-=
q
a.
o
o
Did these trends change from 2004 to
2008? Explain.
-l
J
The CD sales and video sales
decreased in both time periods
and downloaded sales
increased both time periods.
Round your answer to the nearest tenth.
22.8
{
4
o
o
E=
E
6'
I
4. CARS Mr. Thompson plans to purchase
a used car priced at $8400. He will
receive a lSVo employee discount and
then will have to pay a 5.57o sales tax.
What will be the final price of the car?
n
$7532.70
Chapter 2
46
Glencoe Algebra
1