14.64% is the change from 280 to 321
Calculation steps:
[( 321 - 280 ) ÷ 280] x 100 = 14.64%
Formula
Percentage change = [(321 - 280) / 280] x 100
Subtract the new number by the original number
321 - 280 = 41
41 ÷ 280 = 0.14642857142857144
0.14642857142857144 x 100 = 14.64%