Six employees working in a lending company pay $\$250,\$300, \$150,\$200,\$375$ and $\$350$ as income tax. What is the mean income tax paid by their employees ?

Question

$\begin{array}{1 1} (a)\;\$300 \\ (b)\;\$250 \\ (c)\;\$270 \\(d)\;\$280\end{array} $