How is the salary calculated - Formula?

More update on this from a legal expert from an employee union in Denmark:

" There are no official way to calculate the value of one day.

The holiday act says that 1 day holiday is 4,8% of a month salary. That gives: 48.565,30 kr. X 0,048 x 8 = 18.649,07 kr.

And that would give you a month salary on 29.916,22 kr.  In March you had 21.932,72 kr.

The way your company calgulate it, is wrong, because you have paid week.

If they want to make that kind of calculation, that would be:  48.565,30 kr. 8/31 = 12.532,98 kr. In reduction (that is 6000 less that the salary act would give) "

Basically they believe the pay is calculated wrongly and asks to open a case. However, I am hoping our manager can resolve this with HR.