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A stock price is currently $40. It is known that at the end of six months, it will be either $45 or $35. The risk-free rate is 8% per year. (1) Use no-arbitrage method to calculate the value of a six month European call option on the stock with an exercise price of $40. (2) Use risk-neutral valuation method to calculate the value of a six month European put option on the stock with an exercise price of $43. A stock price is currently $40. It is known that at the end of six months, it will be either $45 or $35. The risk-free rate is 8% per year. (1) Use no-arbitrage method to calculate the value of a six month European call option on the stock with an exercise price of $40. (2) Use risk-neutral valuation method to calculate the value of a six month European put option on the stock with an exercise price of $43