26.59% is the change from 504 to 638
Calculation steps:
[( 638 - 504 ) ÷ 504] x 100 = 26.59%
Formula
Percentage change = [(638 - 504) / 504] x 100
Subtract the new number by the original number
638 - 504 = 134
134 ÷ 504 = 0.26587301587301587
0.26587301587301587 x 100 = 26.59%