-87.68% is the change from 812 to 100
Calculation steps:
[( 100 - 812 ) ÷ 812] x 100 = -87.68%
Formula
Percentage change = [(100 - 812) / 812] x 100
Subtract the new number by the original number
100 - 812 = -712
-712 ÷ 812 = -0.8768472906403941
-0.8768472906403941 x 100 = -87.68%