Brain Teaser

A customer walked into a store and purchased four items. The check-out clerk totals the items and tells the customer he owes $7.11. The customer comments on the items costing the same as the name of the store! The clerk says that he simply multiplied the costs of the items to equal $7.11. The customer calmly tells the clerk that the costs of the items should be added, not multiplied. The clerk then informs the customer that the correct total is also $7.11.

What are the exact costs of the 4 items?
What is the mathematical principle used?

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