29.71% is the change from 239 to 310
Calculation steps:
[( 310 - 239 ) ÷ 239] x 100 = 29.71%
Formula
Percentage change = [(310 - 239) / 239] x 100
Subtract the new number by the original number
310 - 239 = 71
71 ÷ 239 = 0.29707112970711297
0.29707112970711297 x 100 = 29.71%