Leena invests $\$4850$ at $7.6 \%$ as simple interest. If she want the money to increase to $ \$8000$, how long will she need to invest her money ?

Question

$\begin{array}{1 1} (a)\;7 \;years\\ (b)\; 8\;years \\ (c)\; 8.5\; years \\ (d)\; 9.5 \; years \end{array}$