-79.23% is the change from 828 to 172
Calculation steps:
[( 172 - 828 ) ÷ 828] x 100 = -79.23%
Formula
Percentage change = [(172 - 828) / 828] x 100
Subtract the new number by the original number
172 - 828 = -656
-656 ÷ 828 = -0.7922705314009661
-0.7922705314009661 x 100 = -79.23%