Plugin Request

I am not a plugin developer or PHP coder so I’m looking for a little help if someone would be so kind. I need a simple plugin that allows me to directly enter data in the backend and then runs a query to display the data in a table in the front end. The only trick is that the query will perform a simple calculation (sum), which the table plugins I have seen have no way of doing this. Would someone be able to whip up something generic real quick that I can at least start from?

Any help would be appreciated.