Your Weekly Cost (In Dollars) to Manufacture X Cars and Y

Multiple Choice

Your weekly cost (in dollars) to manufacture x cars and y trucks is given by $C ( x , y ) = 280,000 + 5,800 x + 4,000 y - 10 x y$
Compute the marginal cost of manufacturing cars at a production level of 20 cars and 10 trucks.

A) $2,875,800
B) $5,600
C) $5,700
D) $100
E) $5,800