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Problem 4.2. A stock is trading at $50. An investor wants you to design her a portfolio whose value after one year will depend on the price of the stock at that time as shown in the figure below. The portfolio value varies linearly between circular markers. How can you structure such a portfolio for her? How much will it cost her? Assume option prices are given by Black-Scholes formulas. Assume that the stock does not pay dividend and its volatility is 40%. The risk-free rate is 5% per annum with continuous compounding. Ignore transaction costs and any other fees. To ensure that your answer is correct, check the value of the portfolio at maturity for a few values of stock price. You don't need to report these checks. Portfolio Value After Six Months O 90 100 10 20 30 40 50 60 70 80 Stock Price After Six Months Problem 4.2. A stock is trading at $50. An investor wants you to design her a portfolio whose value after one year will depend on the price of the stock at that time as shown in the figure below. The portfolio value varies linearly between circular markers. How can you structure such a portfolio for her? How much will it cost her? Assume option prices are given by Black-Scholes formulas. Assume that the stock does not pay dividend and its volatility is 40%. The risk-free rate is 5% per annum with continuous compounding. Ignore transaction costs and any other fees. To ensure that your answer is correct, check the value of the portfolio at maturity for a few values of stock price. You don't need to report these checks. Portfolio Value After Six Months O 90 100 10 20 30 40 50 60 70 80 Stock Price After Six Months

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