Answer :
The average total cost of producing 21 pairs of boots is $23.
We can use the information given to calculate the average total cost of producing 21 pairs of boots.
Total cost of producing 20 pairs of boots = $400
Marginal cost of producing the 21st pair of boots = $83
Total cost of producing 21 pairs of boots = $400 + $83 = $483
Average total cost of producing 21 pairs of boots = Total cost / Quantity = $483 / 21 = $23
Therefore, the correct answer is c. The average total cost of producing 21 pairs of boots is $23.
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