A stock price is currently $70. It is known that at the end of three months it will be either $72 or $68. The risk-free interest rate is 10% per annum with continuous compounding.

A. What is the value of a three-month European put option with a strike price of $70 using no-arbitrage argument?

B. What is the value of a three month European put option with a strike price of 70 using the risk neutral valuation?

Please show work not using excel