-97.1% is the change from 828 to 24
Calculation steps:
[( 24 - 828 ) ÷ 828] x 100 = -97.1%
Formula
Percentage change = [(24 - 828) / 828] x 100
Subtract the new number by the original number
24 - 828 = -804
-804 ÷ 828 = -0.9710144927536232
-0.9710144927536232 x 100 = -97.1%