Company A has a debt due in three years with the amount of $300 per share (need to pay $300 back in year 3). Now the firm falls on hard times and the market value of its assets falls to $250 per share. If Company A cannot increase the value of the firm in the coming three years, it will default. Standard deviation of annual return on Company A's assets is 20%, and annual risk-free rate is 3%. Now you need to calculate the current bond values of Company A considering the option to default in three years. Please show all your work including inputs and answers in each step to get full credit. Keep four decimals.

(a). The option for the stockholders to default in year 3 is a call or a put option?

(b). In order to calculate the value of option to default, what's the value of underlying asset (per share) in the option value calculation? What's the strike price per share? What's the expiration date?

(c). What's the value of the option to default? (You will use Black-Scholes to calculate the option value. Please clearly show what's d1, d2, N(d1), N(d2) and all the inputs to get them)

(d). What's the value of bond/share considering the default option?