The controller of Teton Industries has collected the following monthly expense data for use in analyzing the cost behavior of maintenance costs.
$$
\begin{array}{|c|c|c|}
\hline \text { Month } & \begin{array}{c}
\text { Total } \\
\text { Maintenance Costs }
\end{array} & \begin{array}{c}
\text { Total } \\
\text { Machine Hours }
\end{array} \\
\hline \overline{\text { January }} & \$ 2,900 & 30 \\
\hline \text { February } & 3,000 & 400 \\
\hline \text { March } & 3,600 & 600 \\
\hline \text { April } & 4,300 & 790 \\
\hline \text { May } & 3,200 & 500 \\
\hline \text { June } & 4,500 & 800 \\
\hline
\end{array}
$$
Instructions:
(a) Determine the fixed-cost and variable-cost components using the high-low method.
(b) Prepare a graph showing the behavior of maintenance costs, and identify the fixed-cost and variable-cost elements. Use 200 unit increments and $$\$ 1,000$$ cost increments.