Question

A $40 backpack is in sale for $28. What is the % of change

Answer 1

$28/$40•x/100
100 times $28 is 2800 so then 2800 divided by $40 which would be 70 so the percentage would be 70

Answer 2

$ 40 ..... 100 %
$ 28 ..... x %


`x = (28 \cdot 100)/(40) = 70`

The % of change is 70 %.

This is equivalent with:
- the final price ($ 28) is 70 % from the initial price ($ 40)
- the initial price ($ 40) was reduced with 30% giving the new price as:

`40 - 40 \cdot (30)/(100) = 28`