Jack found a watch which was worth $\$540$ had an offer for sale at $\$450$ during Thanks giving. What percent discount is offered during the sale?

Question

$\begin{array}{1 1} (a)\; \large\frac{25}{6}\% \\ (b)\;\large\frac{50}{3}\% \\ (c)\; \large\frac{75 }{6} \% \\ (d)\; \text{None of the above } \end{array}$