Use the Black-Scholes formula for the following stock:

Time to expiration	= 6 months
Standard deviation	= 50 % per year
Exercise price	= 50
Stock price	= 50
Interest rate	= 3 %

Recalculate the value of the call option if:

a.Time to expiration	= 3 months
b.Standard deviation	= 25 % per year
c.Exercise price	= 55
d.Stock price	= 55
e.Interest rate	= 5 %

Time to expiration
Standard deviation
Exercise price
Stock price
Interest rate