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