A single-priced monopoly that profit maximizes by reducing price from $61 to $60 must have a marginal cost of (remember MC=MR)

A single-priced monopoly that profit maximizes by reducing price from $61 to $60 must have a marginal cost of (remember MC=MR)



a. $21
b. $60
c. $39
d. $0


Answer: a. $21


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