Calculating Yearly Compounded Interest Rate

Good day everyone,

I have a project that I need to do.

I need to get a function to work out interest rate.

I have the following:

Cost of product
Present value
Payment per month
Period

I would like to know how to work out the interest rate. So that means I don't have the percentage.

How would I go about doing that?

For everything that I have searched the formula has the interest rate percentage in the formula.

Thanking you in advance

P.S. We are working on Compounded interest rate (Yearly)