What is the Black$-$Scholes price of a European call option on a non$-$dividend$-$paying stock when the stock price is $$40,$ the strike price is $$32,$ the risk$-$free interest rate is $10\%$ per annum, the volatility is $25\%$ per annum, and the time to maturity is $6$ months? PLEASE SOLVE THIS ON EXCEL SPREEDSHEET.