53. The 100 residents in a small town live in fear of contracting mosquito-borne diseases. A consultant has advised that the most effective method of keeping the mosquito population in check is by aerial spraying of the appropriate insecticide over the whole town. Following table shows the total cost of conducting a given number of aerial sprays each year and the marginal benefit derived by each resident from an extra aerial spray. Number of sprays Total cost ($ per Marginal cost ($ Marginal benefit to Marginal benefit to per year year) per spray) each resident ($ the town ($ per per spray) spray) 0 0 1 200 12 2 400 6 3 600 3 4 800 1 5 1000 0 a) How many aerial sprays will be conducted if each resident has to act independently of the others? (2 Marks) b) What is the efficient level of provisions of aerial sprays? What is the town's net benefit from such a level of provision? (2 Marks) c) How can the town finance the efficient number of aerial sprays? Will voluntary contributions raise the necessary amount? (2 Marks)