12
6
10
2
9
Correct answer is C
The marginal cost is the additional cost incurred in the production of an extra unit of a commodity.
From the table above, the firm incurred an extra cost of N10 to produce an extra unit of the commodity at 3 units.
At 2 units, it spent N32. When it increased the unit of output from 2 to 3, it was produced at N42 thereby incurring an additional cost of N10 in the production cost.
That is, 42 - 32 = 10
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