80.59% is the change from 170 to 307
Calculation steps:
[( 307 - 170 ) ÷ 170] x 100 = 80.59%
Formula
Percentage change = [(307 - 170) / 170] x 100
Subtract the new number by the original number
307 - 170 = 137
137 ÷ 170 = 0.8058823529411765
0.8058823529411765 x 100 = 80.59%