31.94% is the change from 310 to 409
Calculation steps:
[( 409 - 310 ) ÷ 310] x 100 = 31.94%
Formula
Percentage change = [(409 - 310) / 310] x 100
Subtract the new number by the original number
409 - 310 = 99
99 ÷ 310 = 0.3193548387096774
0.3193548387096774 x 100 = 31.94%