-90.46% is the change from 828 to 79
Calculation steps:
[( 79 - 828 ) ÷ 828] x 100 = -90.46%
Formula
Percentage change = [(79 - 828) / 828] x 100
Subtract the new number by the original number
79 - 828 = -749
-749 ÷ 828 = -0.9045893719806763
-0.9045893719806763 x 100 = -90.46%