-85.29% is the change from 136 to 20
Calculation steps:
[( 20 - 136 ) ÷ 136] x 100 = -85.29%
Formula
Percentage change = [(20 - 136) / 136] x 100
Subtract the new number by the original number
20 - 136 = -116
-116 ÷ 136 = -0.8529411764705882
-0.8529411764705882 x 100 = -85.29%