129.41% is the change from 170 to 390
Calculation steps:
[( 390 - 170 ) ÷ 170] x 100 = 129.41%
Formula
Percentage change = [(390 - 170) / 170] x 100
Subtract the new number by the original number
390 - 170 = 220
220 ÷ 170 = 1.2941176470588236
1.2941176470588236 x 100 = 129.41%