The marketing division of a large firm has found that it can model the sales generated by an advertising campaign as 1.4 millions of dollars S(u) 0.75u when the firm invests u thousand dollars in advertising. The firm plans to invest u(x)2.8x + 59x +200 thousand dollars each month where x is the number of months after the beginning of the advertising campaign How quickly will the sales for this firm be changing when x = 16? (Round your answer to three decimal places.) million per month A-

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