-12.39% is the change from 936 to 820
Calculation steps:
[( 820 - 936 ) ÷ 936] x 100 = -12.39%
Formula
Percentage change = [(820 - 936) / 936] x 100
Subtract the new number by the original number
820 - 936 = -116
-116 ÷ 936 = -0.12393162393162394
-0.12393162393162394 x 100 = -12.39%