The accompanying table describes an electric power industry made up of three firms. The numbers in the table show the marginal cost of reducing each ton of methane for each of the three firms. If the EPA reduces total methane emissions for the industry by 6 tons at the lowest possible cost, the cost of methane reduction for the industry would be_________ per day. 

a. $0

b. $275

c. $400

d. $600

e. $300

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Quantity of Methane Reduction (tons/day) 1 2 3 456 84 9 10 Marginal Cost of Methane Reduction ($) Eddie's Electric Eel Company 0 25 50 75 100 125 150 175 200 225 U.S. Power and Pollution 50 100 150 200 250 300 350 400 450 500 Skittish Petroleum 100 150 200 250 300 350 400 450 500 550