Please reason step by step, and put your final answer within \boxed{}.
Toby and his friend are dining out. They each order a cheeseburger for $3.65, Toby gets a milkshake for $2, his friend gets a coke for $1, they split a large fries that cost $4, and his friend gets three cookies that cost $.5 each. They agree to split the bill, which includes a tax. Toby arrived with $15 and is bringing home $7 in change. How much is the tax?
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