4} The value of a shery depends on the number ofpeople using it. The total value mction is given by IJU') = 9000f 10F, where f is the number of people shing in the area. The marginal cost per sher is $1,100. a) If a social planner is attempting to maximize social welfare, what is the optimal number of people using the shery? b} In the tragedy of the commons, users often overburden and overuse common-pool resources. Assuming individual users continue using a resource until average benets are equal to individual marginal costs, what instead is the market equilibrium number of people who overuse the shery? c) Suppose the government wants to ensure that the shery is used optimally (that is, that the number of people using the shery equals the socially optimal number). To meet its goal, the government is imposing a license fee (I) to increase individual costs when using the shery. What is the appropriate license fee (I) to achieve this objective