-24.12% is the change from 170 to 129
Calculation steps:
[( 129 - 170 ) ÷ 170] x 100 = -24.12%
Formula
Percentage change = [(129 - 170) / 170] x 100
Subtract the new number by the original number
129 - 170 = -41
-41 ÷ 170 = -0.2411764705882353
-0.2411764705882353 x 100 = -24.12%