-85.37% is the change from 820 to 120
Calculation steps:
[( 120 - 820 ) ÷ 820] x 100 = -85.37%
Formula
Percentage change = [(120 - 820) / 820] x 100
Subtract the new number by the original number
120 - 820 = -700
-700 ÷ 820 = -0.8536585365853658
-0.8536585365853658 x 100 = -85.37%