Suppose three firms confront the following costs for pollution control: Emissions Reduction Total Costs of Control (Tons per Year Firm A Firm B Firm C $50 $25 $30 120 70 70 W N 200 140 135 290 220 220 Instructions: Enter your responses as a whole number. a. If each firm must reduce emissions by one ton, how much will be spent in total by all three firms? $ 105 b. If the firms can trade pollution rights, what would be the cheapest way of attaining a net three-ton reduction? $ Now suppose the goal is to reduce pollution by six tons. c. What is the marginal cost of the second ton of emissions reduction at (i) Firm A? $ 70 (ii) Firm B? $ 45 (iii) Firm C? $ 40 d. If each firm must reduce emissions by two tons, how much will be spent in total by all three firms? $ 260 e. If the firms can trade permits, what is the cheapest way of attaining a six-ton reduction