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\(\begin{array}{c|c}
\text{Unit of output} & \text...

\(\begin{array}{c|c}
\text{Unit of output} & \text{Table cost}\\
\hline
1 & 20 \\
2 & 32 \\
3 & 42 \\
4 & 48 \\
5 & 50 \\
\end{array}\)

in the above table, the marginal cost of the 3rd unit of output is

A.

12

B.

6

C.

10

D.

2

E.

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