3.93% is the change from 280 to 291
Calculation steps:
[( 291 - 280 ) ÷ 280] x 100 = 3.93%
Formula
Percentage change = [(291 - 280) / 280] x 100
Subtract the new number by the original number
291 - 280 = 11
11 ÷ 280 = 0.039285714285714285
0.039285714285714285 x 100 = 3.93%