Identify Each Cost Below as Variable (V),fixed (F),or Mixed (M),relative

Identify each cost below as variable (V),fixed (F),or mixed (M),relative to units sold.Explain the reason for your answer.
$$\begin{array} { | l | r | r | r | } \hline \text { Units Produced } & 100 & 500 & 1,000 \\\hline \text { Total electric cost } & \$ 1,500 & \$ 1,650 & \$ 1,700 \\\hline \text { Supervisor's monthly salary } & \$ 4,500 & \$ 4,500 & \$ 4,500 \\\hline \text { Assembly line workers' per hour wage rate } & \$ 30 & \$ 30 & \$ 30 \\\hline \text { Total materials cost } & \$ 800 & \$ 4,000 & \$ 8,000 \\\hline \text { Depreciation on factory equipment } & \$ 5,000 & \$ 5,000 & \$ 5,000 \\\hline \text { Total delivery costs } & \$ 1,400 & \$ 1,800 & \$ 2,250 \\\hline\end{array}$$