Use the Black-Scholes formula for the following stock:

Time to expiration	6 months
Standard deviation	51% per year
Exercise price	$41
Stock price	$41
Annual interest rate	6%
Dividend	0

Recalculate the value of the call with the following changes:

a.	Time to expiration	3 months
b.	Standard deviation	30% per year
c.	Exercise price	$45
d.	Stock price	$45
e.	Interest rate	9%

Calculate each scenario independently. (Round your answers to 2 decimal places.)