-83.43% is the change from 857 to 142
Calculation steps:
[( 142 - 857 ) ÷ 857] x 100 = -83.43%
Formula
Percentage change = [(142 - 857) / 857] x 100
Subtract the new number by the original number
142 - 857 = -715
-715 ÷ 857 = -0.8343057176196033
-0.8343057176196033 x 100 = -83.43%