First, it is not clear from the information you presented that it's for 20 days. When interest is quoted in months, we generally figure it on a month. (i.e. one month is 1/12)
Also, are you sure you should use 365 for "banker's" interest? The "bank method" is generally referring to the 360 days and 365 would be "real interest."
And you're correct that someone just giving an answer wouldn't help you learn. However, a lot of people do just want answers - they'll even pay to just get answers. (To exams as well.) If you don't say anything, we don't know. If you have done the work, please always post it and someone can check it. Or ask a specific question about what you don't understand. Otherwise we don't know.
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