42.39% is the change from 309 to 440
Calculation steps:
[( 440 - 309 ) ÷ 309] x 100 = 42.39%
Formula
Percentage change = [(440 - 309) / 309] x 100
Subtract the new number by the original number
440 - 309 = 131
131 ÷ 309 = 0.42394822006472493
0.42394822006472493 x 100 = 42.39%