On a certain transatlantic crossing, 20 percent of a ship`s passengers held round-trip tickets and also took their cars aboard the ship. If 60 percent of the passengers with round-trip tickets did not take their cars aboard the ship, what percent of the ship`s passengers held round-trip tickets?
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A$${33}\cdot\frac{1}{3}\%$$
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B40%
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C50%
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D60%
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E$${6}\cdot\frac{2}{3}\%$$