A shopkeeper in Karol Bagh models his daily profit P(x) = 100x − x² for selling x silk sarees. To find the rate of change of profit when 20 sarees are sold, he calculates P'(20). What is the value?
A shopkeeper in Karol Bagh models his daily profit P(x) = 100x − x² for selling x silk sarees. To find the rate of change of profit when 20 sarees are sold, he calculates P'(20). What is the value?
- A. ₹ 60/saree
- B. ₹ 80/saree
- C. ₹ 40/saree
- D. ₹ 100/saree
Answer: A) ₹ 60/saree
Explanation: Marginal profit P'(x) = 100 − 2x. For x = 20, P'(20) = 100 − 40 = 60.
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