Question

Dean bought a CD player and a pack of 8 batteries. He paid the clerk with two twenty dollar bills and received $7.20 in change. If the CD player cost $29.60, what was the cost of each battery?

Answer 1

Each battery cost `80c`

Explanation:

There is a lot of information in this question.
Use it a bit at a time.

Dean paid with two `$20` bills, which means `$40`.
If he was given `$7.20` change it means the total cost was:

`$40-$7.20 =$32.80`

You can write an equation now to answer the question.

Let the price of each battery be `$x`

`8x+29.60 = 32.80`

`8x = 32.80-29.60`

`8x = 3.20`

`x = 3.20/4`

`x = $0.80`