Grade

Lesson 14

Notes

• Lesson 15• Percent of Change

Objective: Percent of Change

_______________________ – is a ratio that compares the change in quantity to the original amount.

Amount of change original amount

When the new amount is greater than the original, the percent of change is a percent of _______________.

When the new amount is less than the original, the percent of change is a percent of _______________.

Find the percent of change if the original cost was $50 and the new cost is $60. Is it an increase or decrease?

Find the percent of change if the original cost was $5 and the new cost is $1. Is it an increase or decrease?

Find the selling price

The store’s cost plus the markup equals the selling price.

Store Cost + Markup = Selling Price

c + %●c = sp

The bookstore buys a synch sack for $2 and marks it up 250%, how much do they sell them for?

c + %●c = sp 2 + 2.50 ● 2 = sp

Discount = (% of decrease) ● (Regular Price)Regular Price – Discount = Sale Price

c – % ● c = spThe Gap is having a 40% off sale on their winter clothes. How much would you pay if a jackets regular cost was $50? c – % ● c = sp

Find the sale price of each to the nearest cent.Shirt: $39.95, 25% off c – % ● c = sp