22.94% is the change from 170 to 209
Calculation steps:
[( 209 - 170 ) ÷ 170] x 100 = 22.94%
Formula
Percentage change = [(209 - 170) / 170] x 100
Subtract the new number by the original number
209 - 170 = 39
39 ÷ 170 = 0.22941176470588234
0.22941176470588234 x 100 = 22.94%