41.61% is the change from 310 to 439
Calculation steps:
[( 439 - 310 ) ÷ 310] x 100 = 41.61%
Formula
Percentage change = [(439 - 310) / 310] x 100
Subtract the new number by the original number
439 - 310 = 129
129 ÷ 310 = 0.4161290322580645
0.4161290322580645 x 100 = 41.61%