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On a certain transatlantic crossing, 20 percent of a shipâ€™s passengers held round-trip tickets and also took their cars abroad the ship. If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the shipâ€™s passengers held round-trip tickets?
A. 33 1/3% b. 40% C. 50% D. 60% E. 66 2/3
the answer is c.please give me detailed explanation