$17.$ The spot price of a stock is S$0=50,$ the risk$-$free interest rate is $3\%$ per year, and the stock pays no dividends. The theoretical forward price for a one$-$year contract is F$0=51\mathrm{.}50,$ but the observed forward price in the market is F$0=49\mathrm{.}50.$ Is there an arbitrage opportunity? If so$,$ describe the arbitrage strategy.