-81.04% is the change from 828 to 157
Calculation steps:
[( 157 - 828 ) ÷ 828] x 100 = -81.04%
Formula
Percentage change = [(157 - 828) / 828] x 100
Subtract the new number by the original number
157 - 828 = -671
-671 ÷ 828 = -0.8103864734299517
-0.8103864734299517 x 100 = -81.04%