12.05% is the change from 249 to 279
Calculation steps:
[( 279 - 249 ) ÷ 249] x 100 = 12.05%
Formula
Percentage change = [(279 - 249) / 249] x 100
Subtract the new number by the original number
279 - 249 = 30
30 ÷ 249 = 0.12048192771084337
0.12048192771084337 x 100 = 12.05%