Question 3 (15 points) The weekly cost (in dollars) to manufacture x bicycles and y tricycles is: C(x, y) = 20, 000 + 60x +20y +50\\xy a) Determine the marginal cost of a bicycle (2 points) b) Determine the marginal cost of a tricycle (2 points) c) Determine the average cost C(x, y) (1 points) d) Determine the marginal average cost of a bicycle at a production level of five bicycles and five tricycles (2 points) e) Determine the marginal average cost of a tricycle at a production level of five bicycles and five tricycles (2 points) f) Determine the following second order partial derivatives 22 22 22 ax 2 C(x, y) C(x, y) and 22 Oxdy C(x, y ) , C(x, y) (6 points)