-89.9% is the change from 812 to 82
Calculation steps:
[( 82 - 812 ) ÷ 812] x 100 = -89.9%
Formula
Percentage change = [(82 - 812) / 812] x 100
Subtract the new number by the original number
82 - 812 = -730
-730 ÷ 812 = -0.8990147783251231
-0.8990147783251231 x 100 = -89.9%