Following are the marginal abatements costs of two sources. They currently emit 20 tons each. Marginal Abatement Costs Emissions Source A 20 0 18 4 16 8 14 12 12 16 10 20 8 24 6 28 4 36 2 54 0 96 Source 0 8 16 28 40 60 84 112 152 200 360 a. What would the total abatements costs be for a cutback to a total of 20 units by closing Source A? by closing Source B? b. What would the total abatements costs be for an equiproportional cutback to a total of 20 tons? c. Suppose 20 transferable discharge permits are printed, each of which entitles the holder to 1 ton of emissions. They are distributed equally to the two sources. What will the final emissions be for each of the two sources and the total abatement costs after all adjustments have been made? Explain. d. Discuss whether the following statement is true: "if the permits are originally distributed in a different way (say all to one source and none to the other), the final results would be the same in terms of total and individual emissions, but the distribution of the gains from trade will be different between the two sources."