10.75% is the change from 279 to 309
Calculation steps:
[( 309 - 279 ) ÷ 279] x 100 = 10.75%
Formula
Percentage change = [(309 - 279) / 279] x 100
Subtract the new number by the original number
309 - 279 = 30
30 ÷ 279 = 0.10752688172043011
0.10752688172043011 x 100 = 10.75%