Read the following SAT test question and then click on a button to select your answer.

　　The price of 10 pounds of apples is d dollars. If the apples weigh an average of 1 pound for every 6 apples, which of the following is the average price, in cents, of a dozen such apples?

　　(A) 20d

　　(B) (50d)/3

　　(C) 5d

　　(D) (5d)/3

　　(E) d/20

　　Explanation

　　If 6 apples weigh 1 pound, then a dozen (12) apples weigh 2 pounds. The price of a dozen apples is the price of 2 pounds of apples. The price of 10 pounds of apples is d dollars, or 100d cents, so the price of 2 pounds of apples is 1/5 of 100d cents, or 20d cents.

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（编辑：马菲）