# Percent of Change

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8/8/2012
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```							Percent of Change

Lesson 4.4
Objectives: To solve
problems involving
percent of increase or
decrease.
Real World Application
   If you’ve ever bought a package of marshmallows, you’ve
mostly bought air. That’s right, marshmallows are 80% air!
The marshmallow was invented in ancient Egypt and made
with honey and the sap of the mallow plant that grows in
swamps, or marshes.

   Today, marshmallows are mass produced and made from
cornstarch and gelatin. In 1955, the height of marshmallow
making in the United States, there were 30 marshmallow
companies. Today there are only a handful.
Real World Application (continue)

   Let’s say there are only six marshmallow companies
today. You can write a ratio that compares the
amount of decrease in marshmallow companies to
the original number of companies in 1955. This ratio
can be written as a percent.

To find the percent of increase or decrease:
   First, subtract to find the amount of change.
   Then divide by the original number.
Real World Application (continue)

   A retailer increased the price of ball-point
pens from \$0.40 to \$0.45 each. What was
the percent of increase?
   Pages 204 – 205 Check Understanding # 1-2
   Page 207 # 1- 14, 30 – 38
   Practice Worksheet 4.4 # 1 - 27

```
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