Effect of Advertising on Sales The total sales S of Cannon Precision Instruments is related to the amount of money x that Cannon spends on advertising its products by the function S(x) = -0.002x3 + 0.3x2 + x + 510 (0 sxs 200) where S and x are measured in thousands of dollars. Find the inflection point of the function S. (x, y) =

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