I would like to put a few excel functions into my 15C, but I do not know how they are derived.

For example, the PMT function in excel will calculate "the payment for a loan based on constant payments and a constant interest rate".

So my question for this group. Where on the net is a good place to see how the PMT function (and other 12C like function) were derived?

When you Google for PMT and excel, you get dozens and dozens of "Excel for dummies" sites. I can't find any "the PMT function comes from this" sites.

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ee

Do the 12C manuals on the Museum DVD have it? Hmm...