-75% is the change from 72 to 18
Calculation steps:
[( 18 - 72 ) ÷ 72] x 100 = -75%
Formula
Percentage change = [(18 - 72) / 72] x 100
Subtract the new number by the original number
18 - 72 = -54
-54 ÷ 72 = -0.75
-0.75 x 100 = -75%
Example