31.91% is the change from 235 to 310
Calculation steps:
[( 310 - 235 ) ÷ 235] x 100 = 31.91%
Formula
Percentage change = [(310 - 235) / 235] x 100
Subtract the new number by the original number
310 - 235 = 75
75 ÷ 235 = 0.3191489361702128
0.3191489361702128 x 100 = 31.91%