-89.78% is the change from 812 to 83
Calculation steps:
[( 83 - 812 ) ÷ 812] x 100 = -89.78%
Formula
Percentage change = [(83 - 812) / 812] x 100
Subtract the new number by the original number
83 - 812 = -729
-729 ÷ 812 = -0.8977832512315271
-0.8977832512315271 x 100 = -89.78%