-99% is the change from 798 to 8
Calculation steps:
[( 8 - 798 ) ÷ 798] x 100 = -99%
Formula
Percentage change = [(8 - 798) / 798] x 100
Subtract the new number by the original number
8 - 798 = -790
-790 ÷ 798 = -0.9899749373433584
-0.9899749373433584 x 100 = -99%