A company is increasing production of an item at the rate of 50 units per day. All units produced can be sold. The daily demand function is given by p=50-(x/200) where x is the number of units produced (and sold) and p is price in dollars. Find the rate of change of revenue with respect to time (in days) when the daily production is 200 units. 题目看得懂，但是不知道怎麽求...麻烦高手了... 答案是 2400 --

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