Question

A backpack that normally sells for $39 is on sale for 33% off. How do you find the amount of the discount and the sale price?

Answer 1

The amount of the discount is $12.87 and the sale price is $26.13

Explanation:

The formula for the percent increase of decrease of something is `p = (N - O)/O * 100` where `p` is the percent change, `N` is the new price and `O` is the old price. Substituting what we know gives:

`-33 = (N - 39)/39 * 100`

Solving for N gives:

`-33/100 = (N - 39)/39`

`(39 * -33) /100 = N - 39`

`-1287/100 = N - 39`

`-12.87 + 39 = N`

`N = 26.13`