Dave bought a pair of trousers and a briefcase in department store. The sum of the prices of the trousers and the briefcase's without sales tax is $\$130.00$. There was no sales tax on the trousers and a $8\%$ sales tax on briefcase. The prices after the sales tax is $\$136.40$. What was the price in dollars for the trousers?

Question

$\begin{array}{1 1} a)\; \$50 \\ b)\;\$55 \\ c)\;\$60 \\ d)\;\$75 \end{array} $