38.83% is the change from 309 to 429
Calculation steps:
[( 429 - 309 ) ÷ 309] x 100 = 38.83%
Formula
Percentage change = [(429 - 309) / 309] x 100
Subtract the new number by the original number
429 - 309 = 120
120 ÷ 309 = 0.3883495145631068
0.3883495145631068 x 100 = 38.83%