The demand x for a web camera is 35,000 units per month when the price is $25 and 40,000 units when the price Find the profit P, in dollars, as a function of x. $15. The initial investment is $250,000 and the cost per unit is $12. Assume that the demand is a linear function of the price. P(x) = Using the differential approximate the change in profit for a one-unit increase in sales when x = 21,000. dP dollars

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