30.5% is the change from 318 to 415
Calculation steps:
[( 415 - 318 ) ÷ 318] x 100 = 30.5%
Formula
Percentage change = [(415 - 318) / 318] x 100
Subtract the new number by the original number
415 - 318 = 97
97 ÷ 318 = 0.3050314465408805
0.3050314465408805 x 100 = 30.5%