20. Since changes in Fixed Costs don't affect marginal costs the answer is the same as in the previous question for the same reason.

   The firm must hire a 6th worker to obtain the 52nd unit of output. Since it must pay these workers $20 per hour and since the 6th worker adds 5 units of output (the MP column) the approximate marginal cost of the units added to production by that worker, including the 52nd unit is $20/5 = $4.

Workers Output MP
1 10 10
2 22 12
3 31 9
4 40 9
5 47 7
6 52 5
7 56 4
8 59 3
9 61 2
10 62 1

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