-40.21% is the change from 286 to 171
Calculation steps:
[( 171 - 286 ) ÷ 286] x 100 = -40.21%
Formula
Percentage change = [(171 - 286) / 286] x 100
Subtract the new number by the original number
171 - 286 = -115
-115 ÷ 286 = -0.4020979020979021
-0.4020979020979021 x 100 = -40.21%