-98.91% is the change from 828 to 9
Calculation steps:
[( 9 - 828 ) ÷ 828] x 100 = -98.91%
Formula
Percentage change = [(9 - 828) / 828] x 100
Subtract the new number by the original number
9 - 828 = -819
-819 ÷ 828 = -0.9891304347826086
-0.9891304347826086 x 100 = -98.91%