Question

A camera is selling for $7.50 off the regular price. It was marked down 15%. A student used the equation:

15(7.5) = Original price

and found the regular price of the camera to be $112.50.

Explain the error(s) in the student’s work.

Answer 1

Sample Response: The student should have divided the discounted amount by the percent. The percent should have been written as a decimal.

Explanation:

on edge

Answer 2

A camera is selling for $7.50 off the regular price. It was marked down 15%.

Let the regular price be x

We can solve as follows:

`x-0.15x=7.50`

=>
`0.85x=7.50`

=> x = 8.82

The correct regular price is $8.82.

A student used the equation:

15(7.5) = Original price

and found the regular price of the camera to be $112.50.

The student did the wrong calculation. He simply took 15% of selling price.

He should have done 15% of regular price that will come to be the selling price.