The total cost of 5 pens and 6 books is $24.25. If the cost of a pen is $a, and a book is $2.30 more expensive, find $a. Give your answer to two decimal places.

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The total cost of 5 pens and 6 books is $24.25. If the cost of a pen is $a, and a book is $2.30 more expensive, find $a. Give your answer to two decimal places.

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