If the average total cost of producing 20 units of output is $15 and the average total cost of 21 units of output equals $15, then the marginal cost of the 21st unit is _____.
a.$18
b.$20
c.$20
d.$15
e.$12
If the average total cost of producing 20 units of output is $15 and the average total cost of 21 units of output equals $15, then the marginal cost…
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