Working with Percents

Percents are a way to describe parts of a whole out of 100. In 7th grade, you'll apply percents to real situations like shopping discounts and simple interest.

Calculating Discounts

To find a sale price, calculate the discount by finding the percent of the original price, then subtract it.

Simple Interest Formula

Use the formula \( I = Prt \) where:

• \( I \) is interest,
• \( P \) is the principal (original amount),
• \( r \) is the rate as a decimal,
• \( t \) is time in years.

Everyday Impact

Understanding percents helps you make smart financial choices, like knowing how much you'll save in a sale or how much money your savings account earns.