39.03% is the change from 310 to 431
Calculation steps:
[( 431 - 310 ) ÷ 310] x 100 = 39.03%
Formula
Percentage change = [(431 - 310) / 310] x 100
Subtract the new number by the original number
431 - 310 = 121
121 ÷ 310 = 0.3903225806451613
0.3903225806451613 x 100 = 39.03%