-90.15% is the change from 812 to 80
Calculation steps:
[( 80 - 812 ) ÷ 812] x 100 = -90.15%
Formula
Percentage change = [(80 - 812) / 812] x 100
Subtract the new number by the original number
80 - 812 = -732
-732 ÷ 812 = -0.9014778325123153
-0.9014778325123153 x 100 = -90.15%