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Selling x items brings R(x) = 5x² + 20x + 10 rupees. Marginal revenue at 4 items?
ARs 100
BRs 40
CRs 80
DRs 60
Answer & Solution
Correct answer: D. Rs 60
R'(x) = 10x + 20, giving 60 at x = 4.
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