A STOCK is priced at $55.68 with CALLS priced at $2.47 having 13 weeks to expiration. What is the EXERCISE PRICE (X) of the calls if similar PUT options (same time to expiration) are priced at $3.93. The risk-free rate is currently 6.00%. Assume put/call parity, continuous compounding, and 52 weeks per year. \begin{tabular}{l} \hline 56.00 \\ \hline 57.00 \\ \hline 59.00 \\ \hline 58.00 \\ \hline 60.00 \end{tabular}