If C$($x$)=17,000+400$x $3\mathrm{.}2$x$2+0\mathrm{.}004$x$3$ is the cost function and p$($x$)=2,8008$x is the demand function, find the production level $($in units$)$ that will maximize profit. $($Hint: If the profit is maximized, then the marginal revenue equals the marginal cost.$)$