-27.89% is the change from 857 to 618
Calculation steps:
[( 618 - 857 ) ÷ 857] x 100 = -27.89%
Formula
Percentage change = [(618 - 857) / 857] x 100
Subtract the new number by the original number
618 - 857 = -239
-239 ÷ 857 = -0.27887981330221706
-0.27887981330221706 x 100 = -27.89%