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A monopoly's demand function is Q =  80 - P/6

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A monopoly's demand function is Q =  80 - P/6. The interval marginal cost is 7Q and the external marginal cost is 3Q. What is the socially efficient output for the firm, 
a) 30 
b) None of these answers listed is correct 

c) 24
d) 12
e) 40