Currently, stock price = 50, exercise price = 50, volatility of return = σ = 0.4, time
to maturity = 1 year, yearly risk free rate = 0.07
Now calculate the call and the put option prices using 1) the Black Scholes formulas
and 2) the risk neutral valuation method。
black scholes formulas这个解出来了
第二个怎么解阿?谢谢