-87.92% is the change from 828 to 100
Calculation steps:
[( 100 - 828 ) ÷ 828] x 100 = -87.92%
Formula
Percentage change = [(100 - 828) / 828] x 100
Subtract the new number by the original number
100 - 828 = -728
-728 ÷ 828 = -0.8792270531400966
-0.8792270531400966 x 100 = -87.92%