33.87% is the change from 310 to 415
Calculation steps:
[( 415 - 310 ) ÷ 310] x 100 = 33.87%
Formula
Percentage change = [(415 - 310) / 310] x 100
Subtract the new number by the original number
415 - 310 = 105
105 ÷ 310 = 0.3387096774193548
0.3387096774193548 x 100 = 33.87%