Mathematics
Grade10
Easy
Question
A music store is running the following promotions.
Use composition of function to find the sale price of a $ 90 purchase when a discount of $ 5 is applied prior to the 15% discount.
- $ 81.50
- $ 72.25
- $ 97.75
- $ 71.50
The correct answer is: $ 72.25
To find the sale price of a $ 90 purchase when a discount of $ 5 is applied prior to the 15% discount.
Given the total purchase price of $ 90.
$ 5 off ⇒ $ 90 - $ 5 = $ 85
Then 15% discount ⇒ $ 85 – 15% of $ 85 = $ 85 – $ 12.75 = $ 72.25
The sale price of a $ 90 purchase when a discount of $ 5 is applied prior to the 15% discount is $ 72.25.
