27.12% is the change from 638 to 811
Calculation steps:
[( 811 - 638 ) ÷ 638] x 100 = 27.12%
Formula
Percentage change = [(811 - 638) / 638] x 100
Subtract the new number by the original number
811 - 638 = 173
173 ÷ 638 = 0.2711598746081505
0.2711598746081505 x 100 = 27.12%