40% is the change from 310 to 434
Calculation steps:
[( 434 - 310 ) ÷ 310] x 100 = 40%
Formula
Percentage change = [(434 - 310) / 310] x 100
Subtract the new number by the original number
434 - 310 = 124
124 ÷ 310 = 0.4
0.4 x 100 = 40%
Example