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A price p (in dollars) and demand a for a product are related by 2x2 - 2xp + 50p2 = 29600. If the price is

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A price p (in dollars) and demand a for a product are related by 2x2 - 2xp + 50p2 = 29600. If the price is increasing at a rate of 2 dollars per month when the price is 20 dollars, find the rate of change of the demand. Rate of change of demand = -48.5714

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