-90.35% is the change from 860 to 83
Calculation steps:
[( 83 - 860 ) ÷ 860] x 100 = -90.35%
Formula
Percentage change = [(83 - 860) / 860] x 100
Subtract the new number by the original number
83 - 860 = -777
-777 ÷ 860 = -0.9034883720930232
-0.9034883720930232 x 100 = -90.35%