26.54% is the change from 309 to 391
Calculation steps:
[( 391 - 309 ) ÷ 309] x 100 = 26.54%
Formula
Percentage change = [(391 - 309) / 309] x 100
Subtract the new number by the original number
391 - 309 = 82
82 ÷ 309 = 0.26537216828478966
0.26537216828478966 x 100 = 26.54%