The Following Data Show the Total Output for a Firm

The following data show the total output for a firm when specified amounts of labour are combined with a fixed amount of capital.When answering the questions,you are to assume that the wage per unit of labour is $25 and the cost of the capital is $100. $$\begin{array} { | l | c | } \hline \text { Labour per unit of time } & \text { Total output } \\\hline 0 & 0 \\\hline 1 & 25 \\\hline 2 & 75 \\\hline 3 & 175 \\\hline 4 & 250 \\\hline 5 & 305 \\\hline\end{array}$$ TABLE 7- 4
-Refer to Table 7- 4.The total variable cost of producing 305 units of output is

A) $325.
B) $305.
C) $225.
D) $100.
E) $125.