Question: I need help about Accounting Information System. I need to understand how to build calculations with QBE on Database Access. The problem is below. I

I need help about Accounting Information System. I need to understand how to build calculations with QBE on Database Access.

The problem is below. I can list them by using QBE on Access database, but I don't know how to solve "compute the extension...." part.

e. List Invoice, ItemID, Descripton, SellPrice, ListPrice, Quantity, and compute the Extension (SellPrice * Quantity) for all items sold where the SellPrice is different than the listPrice.

There are a few more problems related to calculation on the database. But first, I must understand how to solve the above question. Also, how do I insert a new column if it does not exist on a file on the database?

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