Suppose the market consists of two firms, both of which produce emissions of pollutants during their production process. The firms face the following marginal costs of abating emissions: 1 = 30 + 51, 2 = 42 + 32. Research suggests that the marginal benefit of abating emissions is = 88.5 - 4.5, where = 1+2. is the quantity abated in millions of tonnes, and the benefit and costs are given in /tonne. a) What is the socially efficient level of emissions abatement? [5 marks] b) What should the level of emissions abated by each firm be? [3 marks] c) What should the emission fee be to ensure that the socially optimal level of emissions abatement is reached?