Consider a European call option on a non-dividend-paying stock where the stock price is $40, the strike price is $40, the risk-free rate is 4% per annum, the volatility is 30% per annum, and the time to maturity is six months. Calculate the value of call option using the Black-Scholes formula, giving your answer to 2 decimal places. Tables for N(x) can be found at the end of the text-book.