-50% is the change from 144 to 72
Calculation steps:
[( 72 - 144 ) ÷ 144] x 100 = -50%
Formula
Percentage change = [(72 - 144) / 144] x 100
Subtract the new number by the original number
72 - 144 = -72
-72 ÷ 144 = -0.5
-0.5 x 100 = -50%
Example