A rectangular prism has the following dimensions: $\displaystyle{l}={5}{a}\usepackage{cmbright}\Huge\$ , $\displaystyle{w}={2}{a}\usepackage{cmbright}\Huge\$ , and $\displaystyle{h}={\left({{a}}^{{3}}-{3}{{a}}^{{2}}+{a}\right)}\usepackage{cmbright}\Huge\$ . Use the formula $\displaystyle{V}={l}\cdot{w}\cdot{h}\usepackage{cmbright}\Huge\$ to find the volume of the rectangular prism.