Bunuel wrote:
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%
Assume a number for the total number of books in the school library(100)
Since 60% of the books are cloth bound, the number is \(0.6*100 = 60\)
It is given that 30% of those books are fiction, (i.e) \(0.3*60 = 18\)
Therefore, the cloth-bound fiction books are \(\frac{18}{100}\)or
18%(Option D)
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96% (00:38) correct 
