itunes tax states

What is the tax rate for iTunes?
I know that if you have a iTunes gift card, they take some money out of taxes. Does the company have a total of iTunes percentage of taxes collected, or take certain amounts by state, as they would in a grocery store? If this is a overall tax rate … What is the percentage?
i do not really know what the general percentatge, but is usually about 3 cents. if then the tax would be like .03% lol. or as if your gift card is $ 15 then you will be able to get 14 songs:)
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