Suppose That the Joint Cost (In Dollars) for Two Products

Multiple Choice

Suppose that the joint cost (in dollars) for two products is given by , where x represents the quantity of product X produced and y represents the quantity of product Y produced. Find and interpret the marginal cost with respect to y if 6 units of product X and 10 units of product Y are produced. ​

A) If x remains at 6, the expected change in cost for an 11^th unit of y is $32.
B) If x remains at 6, the expected change in cost for an 11^th unit of y is $15.
C) If x remains at 6, the expected change in cost for an 11^th unit of y is $20.
D) If x remains at 6, the expected change in cost for an 11^th unit of y is $36.
E) If x remains at 6, the expected change in cost for an 11^th unit of y is $51.