13.88% is the change from 281 to 320
Calculation steps:
[( 320 - 281 ) ÷ 281] x 100 = 13.88%
Formula
Percentage change = [(320 - 281) / 281] x 100
Subtract the new number by the original number
320 - 281 = 39
39 ÷ 281 = 0.1387900355871886
0.1387900355871886 x 100 = 13.88%