40.59% is the change from 170 to 239
Calculation steps:
[( 239 - 170 ) ÷ 170] x 100 = 40.59%
Formula
Percentage change = [(239 - 170) / 170] x 100
Subtract the new number by the original number
239 - 170 = 69
69 ÷ 170 = 0.40588235294117647
0.40588235294117647 x 100 = 40.59%