-86.58% is the change from 857 to 115
Calculation steps:
[( 115 - 857 ) ÷ 857] x 100 = -86.58%
Formula
Percentage change = [(115 - 857) / 857] x 100
Subtract the new number by the original number
115 - 857 = -742
-742 ÷ 857 = -0.8658109684947491
-0.8658109684947491 x 100 = -86.58%