Percents And Probability Worksheet With Answers - Lesson 12-19 Page 36
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49In 1999, hernandez paid $2,000 for a new laptop computer. In 2007, hernandez
examPle 4
paid 60% less for a laptop computer than he had in 1999. Find the amount
hernandez paid for a laptop computer in 2007.
s
Th e percent of decrease is given. Find the amount the laptop was decreased by to
olution
subtract it from the cost in 1999.
amount of decrease
______________
Use the percent of change equation.
Percent of decrease =
original amount
0.6 = x
____
Write the percent of decrease as
2000
a decimal.
Multiply both sides by 2,000.
1200 = x
Hernandez paid $1,200 less in 2007 than in 1999.
Th e amount he paid in 2007 is $2000 − $1200 = $800.
Hernandez paid $800 for a laptop computer in 2007.
exercises
Identify the percent of change as an increase or a decrease. Find the percent of change. round percents to
the nearest tenth if necessary.
1.
2.
3.
8 to 10
15 to 18
60 to 40
4.
5.
6.
120 to 60
45 to 60
95 to 80
7.
8.
9.
88 to 44
4 to 12
50 to 60
10.
Fern found the percent of decrease from 80 to 60. Her work is shown below. Find her error and fi x it.
Solve the problem to fi nd the percent of decrease from 80 to 60.
_
_
80 − 60
= 20 __
______
= 0.
3 = 33.
3 %
60
60
11.
According to offi cial census, the population in Oregon in 1990 was 2,842,000.
In 2005 it was 3,631,440. Find the percent of increase in the population of
Oregon from 1990 to 2005. Round your answer to the nearest tenth.
12.
In 2006, Oregon had the fi ft h fastest growth rate in the nation for
employment growth. During that year, the 1,647,222 jobs increased by 3.6%.
Find the number of jobs that were added. Round your answer to the
nearest whole number.
13.
Can an amount be increased by more than 100%? Explain.
106
Lesson 18 ~ Percent Of Change
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