American call options written on Microsoft's common stock are trading for \(\$ 8\). They carry a strike price of \(\$ 100\), and expire 6 months from today. Microsoft does not pay dividends. At present, its stock price is \(\$ 104\). Hence, the calls are \(\$ 4\) in the money. The annualized six-month risk free rate is \(10 \%\). Find an arbitrage opportunity (free lunch) in these numbers and explain how you would exploit it.