-90.1% is the change from 828 to 82
Calculation steps:
[( 82 - 828 ) ÷ 828] x 100 = -90.1%
Formula
Percentage change = [(82 - 828) / 828] x 100
Subtract the new number by the original number
82 - 828 = -746
-746 ÷ 828 = -0.9009661835748792
-0.9009661835748792 x 100 = -90.1%