Question

What is the sale price of a cell phone that is on sale for 15% off if the regular price is $75?

Answer 1

Sale price is `$63.75`

Explanation:

There are 3 different ways to decrease a number by a given percent. Choose the method you find easiest to understand.

1. Find `15%` and subtract it from the regular price.

`15/100 xx75/1" "rarr 15/cancel100^4 xxcancel75^3/1`

=`$11.25" "` this is the amount taken off.

Sale price = `$75-$11.25 =$63.75`

2. Find 85% of the regular price.

If `15%` is taken off the regular price, the remaining amount is `85%`

`85/100 xx 75/1`

=`$63.75`

3. Write the amounts as direct proportion

"If $75 is 100%, how much will 85% be"?

`75/100 = x/85" "larr` now cross-multiply

`x = (75 xx85)/100`

`x = $63.75`