30.97% is the change from 310 to 406
Calculation steps:
[( 406 - 310 ) ÷ 310] x 100 = 30.97%
Formula
Percentage change = [(406 - 310) / 310] x 100
Subtract the new number by the original number
406 - 310 = 96
96 ÷ 310 = 0.3096774193548387
0.3096774193548387 x 100 = 30.97%