Continental Divide. All oi these drivers, of course, expect the road to be tree of ice. While the Colorado Department of Transportation oversees snow removal in Colorado, this task is performed by private companies that use a variety of products that work as freezing-point depressants. Among these, one of the most popular is a sand/salt mixture. The monthly inverse demand for sandfsalt mixture during the winter months in Colorado is P = 90 _ iQ , where price is measured in dollars, and quantity in tons. The market for sand/salt 10 mixture is perfectly competitive, and the marginal cost of producing sandfsalt mixture (inverse supply) is equal to $20 per ton: P : MR: MC : 20 . a. How many tons of salt/sand mixture will be purchased? What is the consumer surplus? What is the producer surplus? Illustrate your answers on a graph. Unfortunately, the use of sand! salt mixture has a negative external effect on drivers. First, it increases the cost of car maintenance because the sand/salt mixture corrodes vehicles and damages Windshields. Second, it increases the cost of car insurance because the salt in the mixture attracts deer, elk, and Big Horn sheep and therefore increases the probability of vehicle-animal collisionsfinjuries. It has been estimated that the marginal external cost (MEC) of each additional ton of sand/salt mixture used on the roads of Colorado is equal to $15. That is, MC = 15. b. What is the total external cost (TEC) to drivers at the equilibrium quantity that you found in a.? c. What is the equation for the marginal social cost (MSC) of sand/salt mixture consumption? d. What is the socially efficient level of consumption? Illustrate both the efficient level of salt/sand mixture consumption and your answer to part a. on a new graph. e. Does marginal cost pricing lead to too much or too little of the sand/salt mixture being sold? Explain in less than five lines. f. Explain why consuming the socially efficient level of production can make everybody better off. In your explanation, refer to a graph in which you indicate the change in consumer surplus