A firm’s average total cost is $30 at 5 units of output and $32 at 6 units of ou

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问题 A firm’s average total cost is $30 at 5 units of output and $32 at 6 units of output. The marginal cost of producing the 6th unit is______.

选项 A、$12
B、$42
C、32
D、2

答案 B

解析答案为B项。本题中5个单位产量的总成本为$30×5=$150，6个单位产量的总成本为$32×6=$192，因此，生产第六个单位产量的边际成本为$192一$150=$42。故本题选B项。

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