>>It's an interest rate on a boat - I don't have any more information here, so I wanted to see the most general term.
>
>Simple interest or compound interest? Fixed rate or variable?
>
>Start here:
>http://www.discoverboating.com/buying/financing/loancalculator.aspx

I like this reply by a customer of this application:

I am fine with 360 or 365.

At the end of the day it is still just a calculation so there is always the chance it can differ by a bit.

:))