0.4% is the change from 502 to 504
Calculation steps:
[( 504 - 502 ) ÷ 502] x 100 = 0.4%
Formula
Percentage change = [(504 - 502) / 502] x 100
Subtract the new number by the original number
504 - 502 = 2
2 ÷ 502 = 0.00398406374501992
0.00398406374501992 x 100 = 0.4%