-87.59% is the change from 798 to 99
Calculation steps:
[( 99 - 798 ) ÷ 798] x 100 = -87.59%
Formula
Percentage change = [(99 - 798) / 798] x 100
Subtract the new number by the original number
99 - 798 = -699
-699 ÷ 798 = -0.8759398496240601
-0.8759398496240601 x 100 = -87.59%