9. The current price of a non-dividend paying stock is 73 . The continuously compounded risk-free rate is 4%. The following table has prices and Greeks for nine-month call options on the stock: a. Estimate the price of the 75 -strike call option if the stock price three days from today is 70 . b. A portfolio consists of the following: 4 long call options with K=70 3 short call options with K=80 6 long put options with K=75 2 short put options with K=70 N shares of stock Determine the value of N (can be positive or negative) so that the portfolio is delta neutral