8.11% is the change from 259 to 280
Calculation steps:
[( 280 - 259 ) ÷ 259] x 100 = 8.11%
Formula
Percentage change = [(280 - 259) / 259] x 100
Subtract the new number by the original number
280 - 259 = 21
21 ÷ 259 = 0.08108108108108109
0.08108108108108109 x 100 = 8.11%