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答案：D
解析：
The graph of function r of (p) = 2000*p-(10*p^2) is a downward-facing parabola that intersects the x-axis at 0 and at 200. Parabolas are symmetric, so the maximum value of r occurs at 100, which is halfway between 0 and 200. (When p=100, the value of r is function r of 100=(2000*(100))-(10*(100^2))=100000.)
