-82.93% is the change from 820 to 140
Calculation steps:
[( 140 - 820 ) ÷ 820] x 100 = -82.93%
Formula
Percentage change = [(140 - 820) / 820] x 100
Subtract the new number by the original number
140 - 820 = -680
-680 ÷ 820 = -0.8292682926829268
-0.8292682926829268 x 100 = -82.93%