If The Average Total Cost Of Producing 20 Units Of Output Is 15 And The Average

/in /by

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​

 
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