41 . Roach Motors is the dominant used- car dealer in a small midwestern city. After paying $50, 000 for overhead, Roach Motors's cost per car is $500. There are 5 other small used-car lots in this town, but since they are not large enough to purchase cars through the same discount sources as Roach, each firm faces the cost function C = 5, 000 + 7000 + 502. The demand for used cars is Q = 200 - P1/10. Assuming Roach is aware of its competitors' costs, what price should Roach set for a used car? a $708 . 33 b . $575 C . $616 . 67 $604 . 17 e . $925