-90.81% is the change from 936 to 86
Calculation steps:
[( 86 - 936 ) ÷ 936] x 100 = -90.81%
Formula
Percentage change = [(86 - 936) / 936] x 100
Subtract the new number by the original number
86 - 936 = -850
-850 ÷ 936 = -0.9081196581196581
-0.9081196581196581 x 100 = -90.81%