C(X, Y) = 15 (10 X + 2 X²)withMC (X) = 15(10 + 4X)

B(X, Y) = 5 (80 X - 2 X² + 40 Y -Y² + 2 X Y)withMB (X) =5 (80 - 4 X + 2 Y)

For Y = 5, derive the benefit function (hint: simply replace y by its value)

Find the value of x for which the net benefit is maximized.

Calculate the values of the benefit, cost and net benefit for this value of x.

Graph the marginal benefit and marginal cost and show this equilibrium graphically.

Graph the benefit and cost functions and show the net benefit maximizing value for x.