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6. Automobiles and industrial factories both contribute to air pollution in Toronto. The total cost of abating automobile emissions is given by CA = YA2 + 8 while the total cost of abating in industry is C, = 2Y? + 20. The total benefits from pollution abatement are B = 0.5Y2 + 4Y + 20 where Y = YA + Y, is the total amount of abatement. a. Calculate the socially optimal amount of abatement activity. b. How much should each sector abate