How to automatically update a formula after typing the last value.

I have a formula that substract total expenses from total sales. However I would like to get the net profit average after day number 2, 3 and so on...located in  column "P" or if it is not possible in column "Q".

The info is in the Menu Details worksheet.

Any help will be very much appreciated
August-2015.xlsm
philosopher76Asked:
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dabug80Commented:
Unfortunately I don't speak Spanish, so it's difficult to decode the headings.

Experts, FYI - the sheet is named 'DETALLE DE MENUS' and is currently hidden on the supplied workbook.
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Hammadh Abdul RahmanCommented:
Place the below formula in P2 and drag down.
=IF(ISNUMBER(P1),(O2-(J2+K2)+P1*A1)/A2,(O2-(J2+K2))/A2)

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August-2015.xlsm
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philosopher76Author Commented:
The solution is perfect. I sent the Spanish version file but Hammadh did a great job!
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