-40.42% is the change from 287 to 171
Calculation steps:
[( 171 - 287 ) ÷ 287] x 100 = -40.42%
Formula
Percentage change = [(171 - 287) / 287] x 100
Subtract the new number by the original number
171 - 287 = -116
-116 ÷ 287 = -0.40418118466898956
-0.40418118466898956 x 100 = -40.42%