-40% is the change from 120 to 72
Calculation steps:
[( 72 - 120 ) ÷ 120] x 100 = -40%
Formula
Percentage change = [(72 - 120) / 120] x 100
Subtract the new number by the original number
72 - 120 = -48
-48 ÷ 120 = -0.4
-0.4 x 100 = -40%
Example