A T.V tower has a height of 100 m , How much population is covered by the T.V broad cast if the average population density around the town is $5000 \;km^{-2}$?

Question

$\begin{array}{1 1}6 \times 10^6 \\ 60 \times 10^6 \\ 600 \times 10^6 \\ 0.6 \times 10^4\end{array}$