-81.91% is the change from 857 to 155
Calculation steps:
[( 155 - 857 ) ÷ 857] x 100 = -81.91%
Formula
Percentage change = [(155 - 857) / 857] x 100
Subtract the new number by the original number
155 - 857 = -702
-702 ÷ 857 = -0.8191365227537923
-0.8191365227537923 x 100 = -81.91%