Figure 23-2
the Following Information Is Available for Maintenance Costs

Essay

Figure 23-2
The following information is available for maintenance costs: $$\begin{array} { l c c } \text { Month } & \text { Production Volume } & \text { Maintenance Costs } \\\text { January } & 75 & £ 250 \\\text { February } & 115 & 310 \\\text { March } & 190 & 400 \\\text { April } & 60 & 240 \\\text { May } & 135 & 355\end{array}$$
-Refer to Figure 23.2. Using a computer or calculator, compute the estimate of variable cost per unit of production using the method of least squares. Rounded to two decimal places, this value would be
a.£3.21.
b.£2.70.
c.£1.31.
d.£1.23.