Pre-Algebra Lesson 6-7 Notes: Percent of Change
[Pages:1]Pre-Algebra
Lesson 6-7 Notes:
Percent of Change
_____________________ _____________________ _____________________
Lesson Objectives: Find the percent of increase or decrease.
Definition: The percent an amount or quantity increases or decreases from the original
amount is the percent of change. To find the percent of change, set-up the fraction
below and then convert it into a percent:
subtract the numbers difference
first number
original
Example 1: The fruit juice company Red Bantam has increased the size of their bottles from 12 oz to 15 oz. Find the percent of increase.
subtract the numbers original number
Example 2: Find the percent of decrease from 1,500 to 1,416.
Example 3: This year there are about 640 students at PJHS. It's projected that there will be about 675 students next year. Find the percent of change. Round to the nearest tenth of a percent.
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