In the following problems assume, unless otherwise stated, that S=$40,=30%, r=8%, and =0. Suppose you sell a 45-strike call with 91 days to expiration. What is delta? If the option is on 100 shares, what investment is required for a delta-hedged portfolio? What is your overnight profit if the stock tomorrow is $39 ? What if the stock price is $40.50 ? Suppose you sell a 40-strike put with 91 days to expiration. What is delta? If the option is on 100 shares, what investment is required for a delta-hedged portfolio? What is your overnight profit if the stock price tomorrow is $39 ? What if it is $40.50 ? Suppose you buy a 40-45 bull spread with 91 days to expiration. If you delta-hedge this position, what investment is required? What is your overnight profit if the stock tomorrow is $39 ? What if the stock is $40.50