27.69% is the change from 242 to 309
Calculation steps:
[( 309 - 242 ) ÷ 242] x 100 = 27.69%
Formula
Percentage change = [(309 - 242) / 242] x 100
Subtract the new number by the original number
309 - 242 = 67
67 ÷ 242 = 0.2768595041322314
0.2768595041322314 x 100 = 27.69%