An electric motor operates on a 50V supply and draws a current of 12 A. If the motor yields a mechanical power of 300 W, what is the percentage efficiency of the motor?

Question

$\begin{array}{1 1} (a)\; 50 \% \\ (b)\; 25 \% \\ (c)\; 5\% \\ (d)\; 2.5\% \end{array}$