-22.94% is the change from 170 to 131
Calculation steps:
[( 131 - 170 ) ÷ 170] x 100 = -22.94%
Formula
Percentage change = [(131 - 170) / 170] x 100
Subtract the new number by the original number
131 - 170 = -39
-39 ÷ 170 = -0.22941176470588234
-0.22941176470588234 x 100 = -22.94%