How much is the exact rate of a freelancing work made up of MS Access Database System?

I made a software insist of a database system software using Ms Access 2003. It includes forms, tables, Sql queries and VBA codes for retrieve, insert, deletes and maintains the tables, including its relationships. Now I want to know what is the exact cost to this product or what is the exact rate that my customer should pay?How much is the exact rate of a freelancing work made up of MS Access Database System?
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