A truck rental agency has the following terms. If a truck is rented for 8 hours or less the charge is RS.100 per hour or RS.8 per km whichever is more. On the other hand , if the truck is rented for more than 8 hours,the charge is RS.80 per hour or RS.6 per km whichever is more. A company rented a truck from the agency, and used it for 120 km and paid RS.800. For how many hours did the company rent the truck? Options:
A) 6  B) 8  C) 10  D) 12  E) 16
We can check each answer by substitution as it is fairly simple.   a) Cost = Max(960,600) = 960. Wrong   b) Cost = Max(960,800) = 960. Wrong   c) Cost = Max(720,800) = 800. Correct answer.   d) Cost = Max(720,960) = 960. Wrong   Answer is hence 10.
<result>C</result>
A truck rental agency has the following terms. If a truck is rented for 8 hours or less the charge is RS.100 per hour or RS.8 per km whichever is more. On the other hand , if the truck is rented for more than 8 hours,the charge is RS.80 per hour or RS.6 per km whichever is more. A company rented a truck from the agency, and used it for 120 km and paid RS.800. For how many hours did the company rent the truck?