-98.87% is the change from 798 to 9
Calculation steps:
[( 9 - 798 ) ÷ 798] x 100 = -98.87%
Formula
Percentage change = [(9 - 798) / 798] x 100
Subtract the new number by the original number
9 - 798 = -789
-789 ÷ 798 = -0.9887218045112782
-0.9887218045112782 x 100 = -98.87%