13.6% is the change from 272 to 309
Calculation steps:
[( 309 - 272 ) ÷ 272] x 100 = 13.6%
Formula
Percentage change = [(309 - 272) / 272] x 100
Subtract the new number by the original number
309 - 272 = 37
37 ÷ 272 = 0.13602941176470587
0.13602941176470587 x 100 = 13.6%