13.27% is the change from 309 to 350
Calculation steps:
[( 350 - 309 ) ÷ 309] x 100 = 13.27%
Formula
Percentage change = [(350 - 309) / 309] x 100
Subtract the new number by the original number
350 - 309 = 41
41 ÷ 309 = 0.13268608414239483
0.13268608414239483 x 100 = 13.27%