30.8% is the change from 237 to 310
Calculation steps:
[( 310 - 237 ) ÷ 237] x 100 = 30.8%
Formula
Percentage change = [(310 - 237) / 237] x 100
Subtract the new number by the original number
310 - 237 = 73
73 ÷ 237 = 0.3080168776371308
0.3080168776371308 x 100 = 30.8%