I work with spread sheets daily. Excel for these purposes is very easy. An addition or subtraction formula is basiclly as simple as typing that function in the cell.

If you don't get what you need from the above guys just shoot me an email and I can generate one for you in about a minute.

I just made one the other day for an insurance quote and surprisingly I don't own 10,000 dollars worth of guns so I must buy more immediately!

 
 
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Riddled with BRD

NRA Life Member