167.74% is the change from 310 to 830
Calculation steps:
[( 830 - 310 ) ÷ 310] x 100 = 167.74%
Formula
Percentage change = [(830 - 310) / 310] x 100
Subtract the new number by the original number
830 - 310 = 520
520 ÷ 310 = 1.6774193548387097
1.6774193548387097 x 100 = 167.74%