13.93% is the change from 280 to 319
Calculation steps:
[( 319 - 280 ) ÷ 280] x 100 = 13.93%
Formula
Percentage change = [(319 - 280) / 280] x 100
Subtract the new number by the original number
319 - 280 = 39
39 ÷ 280 = 0.1392857142857143
0.1392857142857143 x 100 = 13.93%