Percent and Interest Problems

In a certain school library, $60\%$ of the books are clothbound books. If $30\%$ of those are works of fiction, then what percentage of all books in the library are clothbound works of fiction?

A. $90\%$
B. $30\%$
C. $20\%$
D. $18\%$
E. $2\%$

The OA is D

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