Arthur's Plumbing Reported the Following Required:
A

Arthur's Plumbing reported the following:
$\begin{array}{ll}\text { Revenues } & \$ 4,500 \\\text { Variable manufacturing costs } & \$ 900 \\\text { Variable nonmanufacturing costs } & \$ 810 \\\text { Fixed manufacturing costs } & \$ 630 \\\text { Fixed nonmanufacturing costs } & \$ 545\end{array}$
Required:
a.Compute contribution margin.
b.Compute contribution margin percentage.
c.Compute gross margin.
d.Compute gross margin percentage.
e.Compute operating income.