12. On a certain airline, the price of a ticket is directly proportional to the number of miles to be traveled. If the ticket for a 900-mile trip on this airline costs $120, which of the following gives the number of dollars charged for a k-mile trip on this airline?
(A) 2k/15
(B) 2/15k
(C) 15/2k
(D) 15k/2
(E) 40k/3
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