A small town with a demand of $800\;kw$ of electric power at $220\;v$ is situated $15\;km$ away from an electric plant generating power at $440\;v$. The resistance of the two line wires carrying power is $0.5\;\Omega$ per km. The town gets power from the lines through a $4000-220\;v$ Step down transformation at a substation in the town .Characterize the step up transformer at the plant

Question

$\begin{array}{1 1} 440\;v-3000\;v \\ 440\;v- 4000\;v \\ 440\;v- 7000\;v \\ none\;of\;the\;above \end{array} $