-90.34% is the change from 828 to 80
Calculation steps:
[( 80 - 828 ) ÷ 828] x 100 = -90.34%
Formula
Percentage change = [(80 - 828) / 828] x 100
Subtract the new number by the original number
80 - 828 = -748
-748 ÷ 828 = -0.9033816425120773
-0.9033816425120773 x 100 = -90.34%