Subject: mathqa
Question: during a thanksgiving weekend , a car rental company rented 6 - tenths of their vehicles , including two - fifths of the 4 wds that it had . if 40 % of the vehicles are 4 wds , then what percent of the vehicles that were not rented were not 4 wds ?
Option: 
A: 60 %
B: 20 %
C: 40 %
D: 50 %
Answer: C