67.1% is the change from 310 to 518
Calculation steps:
[( 518 - 310 ) ÷ 310] x 100 = 67.1%
Formula
Percentage change = [(518 - 310) / 310] x 100
Subtract the new number by the original number
518 - 310 = 208
208 ÷ 310 = 0.6709677419354839
0.6709677419354839 x 100 = 67.1%