Please fix the errors in the attached screenshot.

Buffelhead's stock price is $$148$ and could halve or double in each six$-$month period $($equivalent to a standard deviation of $98\%).$ A one$-$

year call option on Buffelhead has an exercise price of $$129.$ The interest rate is $21\%$ a year.

a$.$ What is the value of the Buffelhead call?

Note: Round your answer to $2$ decimal places.

b$-1.$ Now calculate the option delta for the second six months if the stock price rises to $$296.$

b$-2.$ Now calculate the option delta for the second six months if the stock price falls to $$74.$

Note: Round your answer to $2$ decimal places.

c$-1.$ What is the option delta when a call is certain to be exercised?

c$-2.$ What is the option delta when a call is certain not to be exercised?

d$.$ Suppose that in month $6,$ the Buffelhead stock price is $$74.$ To replicate an investment in the stock by a combination of call options

and risk$-$free lending, how many calls would you purchase and how much would you lend? For this problem, assume you can purchase

partial calls.

Note: Do not round intermediate calculations. Round your answers to $2$ decimal places.

Answer is complete but not entirely correct.