-88.71% is the change from 877 to 99
Calculation steps:
[( 99 - 877 ) ÷ 877] x 100 = -88.71%
Formula
Percentage change = [(99 - 877) / 877] x 100
Subtract the new number by the original number
99 - 877 = -778
-778 ÷ 877 = -0.887115165336374
-0.887115165336374 x 100 = -88.71%