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.
題目看得懂，但是不知道怎麼求...麻煩高手了...
答案是 2400
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