# Percent of Change - PowerPoint by fjwuxn

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```									COURSE 3 LESSON 6-5

Percent of Change

Ten years ago, Max’s comic book was worth \$2.50.
Now it is worth \$13. Find the percent of increase in value.

amount of change = 13 – 2.50 = 10.50
10.50    amount of change
P = 2.50     original amount

10.50       2.50        4.2     Use a calculator to divide.

= 420%      Use a calculator to divide.
The percent of increase in value is 420%.

Check for Reasonableness 420% of 2.5 400% of 3. Since 400%
of 3 = 12, which is close to 13, the answer is reasonable.

6-5
COURSE 3 LESSON 6-5
Percent of Change

Andre changed the height of his basketball hoop
from 8 ft 4 in. to 9 ft 2 in. Find the percent of increase.

8 ft 4 in. = 8 • 12 + 4 = 100 in.           Write measures in the
9 ft 2 in. = 9 • 12 + 2 = 110 in.           same units.

amount of change = 110 – 100 = 10

10         amount of change
P = 100           original amount

= 0.1          Simplify.

= 10%          Write the decimal as a percent.

The height of the basketball hoop increased by 10%.

6-5

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