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1 pts Assume that the internal marginal cost of producing coal is Minternal 21Q and the external marginal cost is external 90
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Answer #1

At socially optimal level

Marginal Extenal Cost + Marginal Internal Cost = Demand

21Q+9Q = 210-5Q

30Q+5Q = 210

Q = 210/35 = 6 units.

Therefore (d) 6 is the answer to this question

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