One day a car rental agency rented 3/4 of its cars, including 2/3 of its cars with CD players. If 3/5 of its cars have CD players, what percent of the cars that were not rented had CD players?	Pick:  A) 1/2  B) 2/3  C) 3/4  D) 4/5  E) 5/6
The cars with CD players which were not rented is (1/3)(3/5) = 1/5 of all the cars.   The cars which were not rented is 1/4 of all the cars.   The percent of non-rented cars which had C4/5 players is (1/5) / (1/4) = 4/5   The answer is 4/5.
<result>D</result>
One day a car rental agency rented 3/4 of its cars, including 2/3 of its cars with CD players. If 3/5 of its cars have CD players, what percent of the cars that were not rented had CD players?