-88.74% is the change from 879 to 99
Calculation steps:
[( 99 - 879 ) ÷ 879] x 100 = -88.74%
Formula
Percentage change = [(99 - 879) / 879] x 100
Subtract the new number by the original number
99 - 879 = -780
-780 ÷ 879 = -0.8873720136518771
-0.8873720136518771 x 100 = -88.74%