Interest for pawnbroker

I am looking for a certain program that would automatically calculate weekly interest payments for my pawnbrokering and money lending company, many of my clients pay varying interest percentages monthly as well as weekly. Also we would like to be able to omit people who are in arrears.
If you could please be any help to me it would be greatly welcome.
Mark Powell-Richards

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Automatic interest calculations

AnonymousUser |

Microsoft Excel

Anonymous |