27.59% is the change from 638 to 814
Calculation steps:
[( 814 - 638 ) ÷ 638] x 100 = 27.59%
Formula
Percentage change = [(814 - 638) / 638] x 100
Subtract the new number by the original number
814 - 638 = 176
176 ÷ 638 = 0.27586206896551724
0.27586206896551724 x 100 = 27.59%