On a certain transatlantic crossing, 40 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship. If 20 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?
Choose the correct choice from the following choices.
A) 20%	B) 40%	C) 50%	D) 60%	E) 80%
Let T be the total number of passengers.   Let x be the number of people with round trip tickets.   0.4T had round trip tickets and took their cars.   0.8x had round trip tickets and took their cars.   0.8x = 0.4T   x = 0.5T   The answer is 50%.
<result>C</result>
On a certain transatlantic crossing, 40 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship. If 20 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?