-27.29% is the change from 850 to 618
Calculation steps:
[( 618 - 850 ) ÷ 850] x 100 = -27.29%
Formula
Percentage change = [(618 - 850) / 850] x 100
Subtract the new number by the original number
618 - 850 = -232
-232 ÷ 850 = -0.27294117647058824
-0.27294117647058824 x 100 = -27.29%