15. A stock price is currently $30. It is known that at the end of six months it will be either $27 or $33. The risk-free interest rate is 10% per annum with continuous compounding. What is the value of a six-month European put option with a strike price of $317 16. A stock price is currently $100. Over each of the next two six-month periods its standard deviation is expected to be at 24%. The risk-free interest rate is 3% per annum with continuous compounding. What is the value of a one-ycar European put option with a strike price of $98