3) The premium of a call option with a strike price of $50 is equal to $6 and the premium of a call option with a strike price of S60 is equal to $3. The premium of a put option with a strike price of $50 is equal to $4. The risk-free rate of interest is 7%. In the absence of arbitrage opportunities, what should be the premium of a put option with a strike price of $60? All these options have a time to maturity of 6 months. (You are not allowed to use the put-call parity to solve this problem)