31.27% is the change from 307 to 403
Calculation steps:
[( 403 - 307 ) ÷ 307] x 100 = 31.27%
Formula
Percentage change = [(403 - 307) / 307] x 100
Subtract the new number by the original number
403 - 307 = 96
96 ÷ 307 = 0.3127035830618892
0.3127035830618892 x 100 = 31.27%