-89.96% is the change from 857 to 86
Calculation steps:
[( 86 - 857 ) ÷ 857] x 100 = -89.96%
Formula
Percentage change = [(86 - 857) / 857] x 100
Subtract the new number by the original number
86 - 857 = -771
-771 ÷ 857 = -0.8996499416569428
-0.8996499416569428 x 100 = -89.96%