A thrift shop sells pre-owned hardcover books for $\$7$ each and pre-owned paperback books for $\$5$ each.

A thrift shop sells pre-owned hardcover books for $\$7$ each and pre-owned paperback books for $\$5$ each. A customer makes a purchase of both hardcover books and paperback books. Before taxes, the total purchase price of the books is $\$56.$ How many total books did the customer purchase?

A. $7$
B. $8$
C. $9$
D. $10$
E. $11$

OA D

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