-90% is the change from 720 to 72
Calculation steps:
[( 72 - 720 ) ÷ 720] x 100 = -90%
Formula
Percentage change = [(72 - 720) / 720] x 100
Subtract the new number by the original number
72 - 720 = -648
-648 ÷ 720 = -0.9
-0.9 x 100 = -90%
Example