The sales function for a product is given by S$($x$)=93+29\mathrm{.}4$x$^(2)-0\mathrm{.}7$x$^(3),$ where x represents thousands of dollars spent on advertising, x and S is in

thousands of dollars.

Find the point of diminishing returns. Enter the amount spent on advertising as well as the sales in dollars.

Answer

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Amount Spent on Advertising: $

Total Sales: $

No point of diminishing returns