25.39% is the change from 638 to 800
Calculation steps:
[( 800 - 638 ) ÷ 638] x 100 = 25.39%
Formula
Percentage change = [(800 - 638) / 638] x 100
Subtract the new number by the original number
800 - 638 = 162
162 ÷ 638 = 0.25391849529780564
0.25391849529780564 x 100 = 25.39%