12.45% is the change from 249 to 280
Calculation steps:
[( 280 - 249 ) ÷ 249] x 100 = 12.45%
Formula
Percentage change = [(280 - 249) / 249] x 100
Subtract the new number by the original number
280 - 249 = 31
31 ÷ 249 = 0.12449799196787148
0.12449799196787148 x 100 = 12.45%