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A stock price is currently $25. It is known that at the end of two months it will be either $23 or
$ 3.99

A stock price is currently $25. It is known that at the end of two months it will be either $23 or $27. The risk-free interest rate is 10% per annum with continuous compounding. Suppose  is the stock price at the end of two months. What is the value of a derivative that pays off  at this time?

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