A college student earned $8200 during summer vacation

A college student earned $8200 during summer vacation working as a
waiter in a restaurant on the boardwalk at the beach. The student invested part of the money at 7% and the rest at 10%. If the student received a total of $664 in interest at the end of the year, how much was invested at 10%
The amount invested at 10% was
 
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