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knada242Flag for United States of America

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excel formula for credit card interest pulling values from diferent spreadsheet

I have spreadsheets setup that has every 1st and 15th of every month in one workbook. A cell in the current time period pulls the value of one cell and subtracts the payment amount from a different cell of the previous time period. The formula looks like this:  =('040112'!A34)-('040112'!A6)
I would like to add the monthly interest rate to this formula. How to I set that up?
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dlmille
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Thank you for your response. You got me moving in the right direction. I came up with:

=('040112'!A34)*(0.16/12)+('040112'!A34)-('040112'!$A$6)

Right now I am only calculating the interest on a monthly basis in the sheet that is right after the statement date. As time goes on I will refine it more, but this gives me a much better idea of how to build my budget.

Thank you for your help.