Question: Given the underlying stock price S = 2 0 today, its price has a 9 0 % possibility to be S = 1 8 and

Given the underlying stock price S =20 today, its price has a 90% possibility to be S =18 and a 10% possibility to be S =22 in three month. Thus, based on the the non- arbitrage pricing principal, the fair price of a call option expiring in three month at strike price K =21 is 0.633 with the annual risk free interest rate r =12%(See details in the lecture notes). If the current market price of the call falls to 0.5, does there exist an arbitrage opportunity? If yes, construct a strategy to do the arbitrage and explain it.

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