Excel/Math help please

[macs]

Hi,

I'm trying to set up a spread sheet to show the system results of a lay system using a fixed bank % liability of 5%. I've got the compound formula I need but would it produce fairly accurate results if I used the average win dividend instead of manually inputting each result? If there are any commercial products out there that anyone knows of I'd be grateful for a heads up.
Cheers
MAC

[SpeedyBen]

Mac
What is it that you want the commercial product to do?

[macs]

Just trying to work out if my lay systems are profitable on a fixed liability of 5% over different periods of time and results. I've just upgraded my software and apparently that will help do it so hopefully all is good.