3.21% is the change from 280 to 289
Calculation steps:
[( 289 - 280 ) ÷ 280] x 100 = 3.21%
Formula
Percentage change = [(289 - 280) / 280] x 100
Subtract the new number by the original number
289 - 280 = 9
9 ÷ 280 = 0.03214285714285714
0.03214285714285714 x 100 = 3.21%