39.41% is the change from 307 to 428
Calculation steps:
[( 428 - 307 ) ÷ 307] x 100 = 39.41%
Formula
Percentage change = [(428 - 307) / 307] x 100
Subtract the new number by the original number
428 - 307 = 121
121 ÷ 307 = 0.3941368078175896
0.3941368078175896 x 100 = 39.41%