21.03% is the change from 504 to 610
Calculation steps:
[( 610 - 504 ) ÷ 504] x 100 = 21.03%
Formula
Percentage change = [(610 - 504) / 504] x 100
Subtract the new number by the original number
610 - 504 = 106
106 ÷ 504 = 0.21031746031746032
0.21031746031746032 x 100 = 21.03%