27.16% is the change from 243 to 309
Calculation steps:
[( 309 - 243 ) ÷ 243] x 100 = 27.16%
Formula
Percentage change = [(309 - 243) / 243] x 100
Subtract the new number by the original number
309 - 243 = 66
66 ÷ 243 = 0.2716049382716049
0.2716049382716049 x 100 = 27.16%