19.69% is the change from 259 to 310
Calculation steps:
[( 310 - 259 ) ÷ 259] x 100 = 19.69%
Formula
Percentage change = [(310 - 259) / 259] x 100
Subtract the new number by the original number
310 - 259 = 51
51 ÷ 259 = 0.1969111969111969
0.1969111969111969 x 100 = 19.69%