-79.81% is the change from 847 to 171
Calculation steps:
[( 171 - 847 ) ÷ 847] x 100 = -79.81%
Formula
Percentage change = [(171 - 847) / 847] x 100
Subtract the new number by the original number
171 - 847 = -676
-676 ÷ 847 = -0.7981109799291618
-0.7981109799291618 x 100 = -79.81%