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Tc=3q ^2 +7q +12 Marginal cost is change in cost of total cost =6q +7 by taking derivative. So marginal cost=6(3)+7=25 Average cost =vc /q=3q ^2 +7q /q=3q +7=3(3)+7=16
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Sry there is some mistake in it 16 is average variable cost not average cost
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