79.41% is the change from 170 to 305
Calculation steps:
[( 305 - 170 ) ÷ 170] x 100 = 79.41%
Formula
Percentage change = [(305 - 170) / 170] x 100
Subtract the new number by the original number
305 - 170 = 135
135 ÷ 170 = 0.7941176470588235
0.7941176470588235 x 100 = 79.41%