b) European call and put written on stock have the same price 30 and time-to-maturity 3 months. Call is priced at 3 and put at 2.25 . The stock current price is 31. The interest rate is r=10%, p.a. continuously compounding. Is there an arbitrage profit? Set up an arbitrage strategy to explore profit, if any, and give the exact net profit of this strategy. [5]