26.13% is the change from 310 to 391
Calculation steps:
[( 391 - 310 ) ÷ 310] x 100 = 26.13%
Formula
Percentage change = [(391 - 310) / 310] x 100
Subtract the new number by the original number
391 - 310 = 81
81 ÷ 310 = 0.26129032258064516
0.26129032258064516 x 100 = 26.13%