The Demand equation for an item currently being marketed is given by $D(q)=-0\mathrm{.}15*q^2+53,$ where $D(q)$ is in $ that can be charged per unit, and $q$ is in thousands of units that can be sold at that price. $($For example, $q=19$ means $19,000$ units can be sold.$)$ If $1,000$ units are to be sold, at what price should each be set? $($Be careful with units when you do your calculations!$).$

The appropriate price $=5$