Pet Corrector's stock price is $200 and could halve or double in each six-month period. The interest rate is 8% a year, compounded every six months.

A. What is the option delta for the six-month call with an exercise of $180?

B. The payoffs of the six-month call option can be replicated by buying shares of stock and borrowing. What amount should be invested in stock and what amount must be borrowed? Assume the exercise price is $180.