Question: How to change recursion formula

Hello

In my annuity recursion formula I have a payment at the beginning of the month.

How can I change the formula to reflect an addition made on a different day of the month?

This could be done in Excel of course, but I am looking for a single formula which rsolve supplies.

I had no joy with Finance:-growingannuity

Recurring_pmts.mw

 

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