The average (arithmetic mean) cost per book for the \(12\) books on a certain table is \(k\) dollars. If a book that

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The average (arithmetic mean) cost per book for the \(12\) books on a certain table is \(k\) dollars. If a book that costs \(18\) dollars is removed from the table and replaced by a book that costs \(42\) dollars, then in terms of \(k,\) what will be the average cost per book, in dollars, for the books in the table?

A) \(k+2\)

B) \(k - 2\)

C) \(12+ \dfrac{24}{k}\)

D) \(12- \dfrac{24}{k}\)

E) \(12k-6\)

Answer: A

Source: GMAT Prep