Please answer this

3. Consider a 2-lane 10 mile highway in the metropolitan area of Peoria, Illinois. The demand for this highway, the private average cost (AC) of the highway in dollars, and the social marginal cost (MC) are given below. 16 MC 11 AC Demand 2000 2500 Traffic Volume a. What is the equilibrium traffic volume on the highway? b. Is the equilibrium traffic volume efficient? If yes explain. If not, what is the efficient volume and what is the efficient toll that will guarantee that volume? c. If the toll is not charged, how much is the dead weight loss associated with the equilibrium traffic volume? d. If the average fixed cost of constructing the highway is $4, would it be a good idea to expand this highway? Explain