COMPUTATION FOR BUDGET VALUE PER DAY

Hi,

How can we have the calculation for budget per day given the total budget per month? We also need to consider the working days (less the holidays and weekends).

Given data is example:

Budget for June 2013 = 20,000

How can we get the budget value for a specific date range ex. June 2 - 15 only? Do we need to do it on BW backend or in BEx designer?

Thank you.

Regards,

Anne