Task: Question Answering
Input (English): Problem: on a certain transatlantic crossing , 15 percent of a ship ' 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 ship ' s passengers held round - trip tickets ? 
Options: a ) 37.5 % , b ) 40 % , c ) 50 % , d ) 60 % , e ) 66.6 %
Output (English): a