1. Lesson 2­7.notebook October 15, 2012
Lesson 2.7:
*percent of change ­ the ratio of the change in an amount to the original
amount expressed as a percent
*It can be either a percent of increase or a percent of decrease!
Examples­­>Sales tax is an example of a percent of increase &
Discount is an example of a percent of decrease
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2. Lesson 2­7.notebook October 15, 2012
Lesson 2.7 examples:
Determine whether the percent of change is an increase or a decrease...then find
the percent of change. Round to the nearest whole percent.
A) original: 78
new: 125
difference:
(Percent of increase)
P A
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3. Lesson 2­7.notebook October 15, 2012
B) original: 66
new: 30
difference: (Percent of decrease)
P A
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4. Lesson 2­7.notebook October 15, 2012
C) Find the total price of a dress that costs $22.50 and had a sales tax
rate of 7.5%.
D) A skateboard costs $99.99. If you have a coupon for 20% off, how
much will you save?
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