Calculation in Access

I have a problem I am tracking units delivered into 4 categories.  I created a field for each category and if they get a delivery a 1 or 2 is placed in the boxes that was delivered.  When we bill I sum the totals of each field and multiply the sales price.

Except when they get a delivery of box 1 and box 2 together.  Then I need to give them a special price.  So ... if
box 1 they get 20 delivered and box 2 they get 15 delivered I need to calculate this way.  

Combined box 1 and 2  15 * 7.75= 116.25
in Addition I need 5 * 4.50 =  22.50  
 So the total of the boxes would be $138.50

I can do it if Box 1 and Box 2 are equal no problem but if Box 1 and box 2 are not I run into my complication.  

I have to have it as a separate calculated field so I can mail merge it to my word files for the bill..

Help?
cres1121Asked:
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Dale FyeConnect With a Mentor Commented:
Since the individual prices of Box1 and Box2 are both 4.50, then you should be able to use:

IIF(Box1 = Box2, Box1, IIF(Box1 < Box2, Box1, Box2)) * 7.75 + Abs(Box1-Box2) * 4.50

The first part (nested IIF() statement returns the number of boxes in common.
The second part returns the difference between the number of boxes.
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Dale FyeCommented:
Not sure I understand, you mention 4 categories and fields for each category, but then only discuss box 1 and box 2 in your example.  Can you provide some sample data, maybe in a spreadsheet with your computations showing in the example?
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cres1121Author Commented:
This is a spreadsheet with the export from a query.  Box 3 and Box 4 are just calculated total * 4.50.  The only problem I am having is when box 1 total heatable and box 2 totalcold do not =.  I have a iif doing the logic if box1= box2 then box1*7.75, box 1 *4.5.  In Box2 the iif is  if(box1=box2, then 0, box 2*4.5)

The problem is if box 1 has 20 and box 2 has 15 it does each at 4.50 so a total of 35*4.50.  The company would like 15 at 7.75 and 5 * 4.50.
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cres1121Author Commented:
Thanks I needed one more layer but your response got me thinking.  I appreciate the information
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