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题库 / GMATAdvanced-PS-17
A certain manufacturer uses the function C(x)=0.04x2-8.5x+25,000 to calculate the cost, in dollars, of producing x thousand units of its product. The table above gives values of this cost function for values of x between 0 and 50 in increments of 10. For which of the following intervals is the average rate of decrease in cost less than the average rate of decrease in cost for each of the other intervals?
From x=0 to x=10
From x=10 to x=20
From x=20 to x=30
From x=30 to x=40
From x=40 to x=50
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增长速率=C'x = 0.08x-8.5 slope是正的 所以在C'x是负的情况下 x越大 速率越慢
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