How do I calculate?

How do I calculate the rentability of an investment?
For example:
I will invest an X number of £, for Y number of months with the Z % rate of rentability per month.
Please, do not use technical terms.
I don't know them (I am not a English native speaker).
Thank you!!

Answers:
get ms-excel, it's one of their templates
What's 'rentability' (it's not a term I have come across in this context before) == do you mean "Interest" ??
Investments are not rented.

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