Answer :
Total Cost TC=3q2 + 7q + 12
q=3 (Given)
Marginal cost:
TC/q=3*2q +7+0
=6q+7
Since q=3,
6q+7 =6*3 +7
= 18 + 7
= 25
Marginal cost if q=3 is 25.
Average cost:
Average cost= TC/q
And q = 3,
Average Cost = (3*32 + 7*3 + 12)/3
= (27+21+12)/3
= 60/3
= 20
Average cost if q=3 is 20.
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