A company has a cost function C(Q) = 2 Q² + 10Q + 50. What is the marginal cost of producing the 5th one of output?
- $20
- $30
- $40
- $50
Explanation
Marginal cost = derivative of C(Q)C(Q) = 2Q² + 10Q + 50
MC(Q) = dC/dQ = 4Q + 10
For the 5th unit, Q = 5:
MC = 4(5) + 10 = 20 + 10 = $30
Last verified on 24-04-2026
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