26.8% is the change from 638 to 809
Calculation steps:
[( 809 - 638 ) ÷ 638] x 100 = 26.8%
Formula
Percentage change = [(809 - 638) / 638] x 100
Subtract the new number by the original number
809 - 638 = 171
171 ÷ 638 = 0.26802507836990597
0.26802507836990597 x 100 = 26.8%