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Formula based on user input

Is there a formula or vba that will take user input from a couple of cells and use a particular formula in another cell chosen based on the user input?

For example, if user enter Week # = 1, # of Days = 100, then Projected Month End needs to calculate 100/95.  But if user enters Week # = 2, # of Days = 90, then the Projected Month End needs to calculate 90/80.

Month Goal            
Week #            # of Days
Projected Month End
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fabi2004
Asked:
fabi2004
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1 Solution
 
NBVCCommented:
Are those the only options?  Can you explain the logic on how the PME is calculated?
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fabi2004Author Commented:
It's hard to write down everything I'm trying to do with the spreadsheet all in one question.  So I was just going to post it in parts in seperate questions.

Basically, I want a dialog box type of app that a user can quickly view projected end of month sales.  The projection formula is easy.
If it is the beginning of the month (BOM) then the current days are divided by .96 to predict the end of month days.  One week out, projected = current/.93.
2W = current # of days/.92
3W = curret/.88
4W = current/.84
5W = current/.80
6W = current/.76
7W = current/.71
8W = current/.65
9W = current/.60

I know I can use nested IFs in the Projected Month End cell.  I was thinking there might be a more elegant way of programming it using VBA.  I would hate the IFs formula to get accidentally overwritten.
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NBVCCommented:
If you really want VBA, then I will leave to another expert who is more VBA proficient than I....

If you were to use formulas, I would suggest some sort of lookup table show the weeks out number vs. the denominator number, so you would have something like:  

=current/VLOOKUP(A1,mytable,2,0)

where A1 contained the lookup value (week numbers out) and mytable is your lookup table...
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fabi2004Author Commented:
Good option.  Thank you.  I think I will use the VLOOKUP function instead.  It will be easier to modify the percentages later on if they have to be changed.
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NBVCCommented:
You are welcome.
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