-85.06% is the change from 857 to 128
Calculation steps:
[( 128 - 857 ) ÷ 857] x 100 = -85.06%
Formula
Percentage change = [(128 - 857) / 857] x 100
Subtract the new number by the original number
128 - 857 = -729
-729 ÷ 857 = -0.8506417736289381
-0.8506417736289381 x 100 = -85.06%