During a Thanksgiving weekend, a car rental company rented six-tenths of their vehicles, including three-fifths of the 4WDs that it had. If 60% of the vehicles are 4WDs, then what percent of the vehicles that were not rented were not 4WDs?	Choices
A) 20%
B) 30%
C) 40%
D) 60%
E) 25%
4/10 of all the vehicles were not rented.   (2/5)(3/5) = 6/25 of all the vehicles were 4WDs that were not rented.   (6/25) / (4/10) = 3/5 is the fraction of non-rented vehicles that were 4WDs   1 - 3/5 = 40% of non-rented vehicles were not 4WDs.   The answer is 40%.
<result>C</result>
During a Thanksgiving weekend, a car rental company rented six-tenths of their vehicles, including three-fifths of the 4WDs that it had. If 60% of the vehicles are 4WDs, then what percent of the vehicles that were not rented were not 4WDs?