Compute the volatility per annum. The risk free rate is 3
percent per annum and the current value of KOSPI200 is 290. Use the
Black-Scholes OPM and calculate the prices of European call and put
options with a strike price of 285 and the time to maturity of 6
months. You also have to show the value of d1, d2, N(d1) and N(d2)
in your answer (Ignore dividends).