$[(-)/(1)$ Points$]$

The total monthly revenue R$($x$),$ in dollars, generated from sales of Math t $-$shirts is related to the amount x spent on advertising by

R$($x$)=-2$x$^(3)+36$x$^(2)+60$x$+80$

where x is in hundreds of dollars.

Compute the rate of change of revenue with respect to the amount of money spent on advertising.

R$^(\text{'})($x$)=$

Is monthly revenue increasing faster when the amount of money spent on advertising is $560$ dollars or $680$ dollars?

$680$ dollars

$560$ dollars