Need formula help

Need formula help

Can someone give me the function for multiplication of 2 fields and then a % to determine potential commission?

Fields:
Nights.  This is a formula field where I have configured the number of nights a guest is staying based on their check in and check out dates they have selected.

Nightly budget. This is a currency field .

I would like to multiply the Nights * Nightly budget then *15%.

Thanks!