41.75% is the change from 309 to 438
Calculation steps:
[( 438 - 309 ) ÷ 309] x 100 = 41.75%
Formula
Percentage change = [(438 - 309) / 309] x 100
Subtract the new number by the original number
438 - 309 = 129
129 ÷ 309 = 0.4174757281553398
0.4174757281553398 x 100 = 41.75%