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A manufacturer can sell x items at the price of Rs. `(330-x)` each. The cost of producing xitems is Rs. `x^2+ 10x-12`. How many items must be sold so

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A manufacturer can sell x items at the price of Rs. `(330-x)` each. The cost of producing xitems is Rs. `x^2+ 10x-12`. How many items must be sold so that his profit is maximum?
A. 20
B. 40
C. 60
D. 80
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Correct Answer - D
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