82.35% is the change from 170 to 310
Calculation steps:
[( 310 - 170 ) ÷ 170] x 100 = 82.35%
Formula
Percentage change = [(310 - 170) / 170] x 100
Subtract the new number by the original number
310 - 170 = 140
140 ÷ 170 = 0.8235294117647058
0.8235294117647058 x 100 = 82.35%