Question

What is the percent change from 30 to 15.

Answer 1

A decrease of 50%

1) Considering the first number to be 30 we can write out

30 ------100%

15 ------- x

2) Cross multiplying it, we have:

1500=30x

x=50

Since 15 is 50% then we can subtract 50% from 100% and the answer is

A decrease of 50%