2. Your weekly cost (in dollars) to manufacture x cars and y trucks is Z=C(x,y)=240000+6000x +4000y - 0.1xy2 a. Compute the marginal cost of manufacturing cars at a production level of 20 cars and 10 trucks. (2pts) b. Compute the marginal cost of manufacturing trucks at a production level of 20 cars and 10 trucks. (2pts) C. Find the z-intercept. What does the z-intercept tell you about cost? (3pts)