4. (20%; 4% for each subquestion) The following information is given for the European call option on Schlumberger (SLB). S-86.89, X90,r-1.0% (continuously compounded interest rate). T 19/365 0.0521, actual call option price = 1.21 and no cash dividend is expected by option expiration. (a) When we select an initial implied volatility (o) of 0.40, what value does the Black-Scholes model predict for the call option on SLB? (b) If an adjustment to the initial guess of implied volatility would be needed, should we increase or decrease our initial guess? C Ste (e) Calculate the vega -) using the initial selected volatility of 0.40. ao 21 (d) Based on a +10 C(0) - Cmarket what is our new guess for the implied volatility? C'(0) (e) Calculate the implied volatility using EXCEL 4. (20%; 4% for each subquestion) The following information is given for the European call option on Schlumberger (SLB). S-86.89, X90,r-1.0% (continuously compounded interest rate). T 19/365 0.0521, actual call option price = 1.21 and no cash dividend is expected by option expiration. (a) When we select an initial implied volatility (o) of 0.40, what value does the Black-Scholes model predict for the call option on SLB? (b) If an adjustment to the initial guess of implied volatility would be needed, should we increase or decrease our initial guess? C Ste (e) Calculate the vega -) using the initial selected volatility of 0.40. ao 21 (d) Based on a +10 C(0) - Cmarket what is our new guess for the implied volatility? C'(0) (e) Calculate the implied volatility using EXCEL