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Bunuel
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%


Let total no of books be X.
Then
Percentage of books Clothbound fiction =0.3*0.6X / X *100
= 18

Option D.
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Bunuel
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%

We can let the number of books = n; thus:

0.6 x 0.3 x n = 0.18n = clothbound books that are fiction

Thus, 18% of the books are clothbound books that are fiction.

Answer: D
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