7. Assume the following information for a stock and a call option written on the stock:

Exercise price = K40

Current stock price= 30

The variance (²) .25 0r 25%

Time to expiration, .25year or a quarter

Risk free rate of return= 5% per annum

Answer the below questions

Use the Black-Scholes procedure to determine the value of the call option

Change the time to expiration, t, to 0.5 or six month and compute the call value again