A group of elderly citizens chartered a bus for $\$160$. However at the last minute, $8$ of them fell ill and had to miss the trip. As a result, the others had to pay an extra $\$1$ each. How many people went on the trip ?

Question

$\begin{array}{1 1} (a)\;30 \\ (b)\;40\\ (c)\;60 \\(d)\;80 \end{array} $