The relationship between marketing expenditures $($x$)$ and sales $($y$)$ is given by the following formula, y $=8$x $0\mathrm{.}05$x$2+6.($Hint: Use the Nonlinear Solver tool$).$

What level of marketing expenditure will maximize sales?

Note: Round your answer to $2$ decimal places.

What is the maximum sales value?

Note: Round your answer to $2$ decimal places.