27.43% is the change from 638 to 813
Calculation steps:
[( 813 - 638 ) ÷ 638] x 100 = 27.43%
Formula
Percentage change = [(813 - 638) / 638] x 100
Subtract the new number by the original number
813 - 638 = 175
175 ÷ 638 = 0.274294670846395
0.274294670846395 x 100 = 27.43%