Problem 21-12 Black–Scholes model
Use the Black–Scholes formula to value the following
options:
a. A call option written on a stock selling for
$68 per share with a $68 exercise price. The stock's standard
deviation is 6% per month. The option matures in three months. The
risk-free interest rate is 1.75% per month.
b. A put option written on the same stock at
the same time, with the same exercise price and expiration
date.