-81.13% is the change from 636 to 120
Calculation steps:
[( 120 - 636 ) ÷ 636] x 100 = -81.13%
Formula
Percentage change = [(120 - 636) / 636] x 100
Subtract the new number by the original number
120 - 636 = -516
-516 ÷ 636 = -0.8113207547169812
-0.8113207547169812 x 100 = -81.13%