-70% is the change from 240 to 72
Calculation steps:
[( 72 - 240 ) ÷ 240] x 100 = -70%
Formula
Percentage change = [(72 - 240) / 240] x 100
Subtract the new number by the original number
72 - 240 = -168
-168 ÷ 240 = -0.7
-0.7 x 100 = -70%
Example