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Wk Qu$.8-11$ The relationship between marketing expenditures...

The relationship between marketing expenditures $(x)$ and sales $(y)$ is given by the following formula, $y=9x-0\mathrm{.}10x^2+6.($Hint: Use the Nonlinear Solver tool$).$

a$.$ What level of marketing expenditure will maximize sales? $($Round your answer to $2$ decimal places.$)$

Marketing expenditure

b$.$ What is the maximum sales value? $($Round your answer to $2$ decimal places.$)$

Maximum sales value

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