Question

A store has a coupon for $10 off and a discount of 20%. Write a function for the coupon. Use x for the original price and C for the price after the coupon is applied.

Answer 1

Explanation:

We know some facts:

• x for the original price.
• The store has a coupon for $10 off and a discount of 20%
• C for the price after the coupon is applied.

So from the statement 2, you can realize there are two types of discounts:

1. The discount offered by the coupon
2. The discount offered by 20%

Since we need to write a function just for the coupon, then we don't include the discount offered as percentage, then we subtract the coupon from the original price:

$\boxed{C=x-10}$