Consider a non$-$dividend paying stock trading at $$50$ and the risk$-$free rate is at $4\mathrm{.}5\%.$ A calloption on the stock has an exercise price of $$45,$ expiring in $2$ years. The standard deviation of the stock$$s return is $0\mathrm{.}15$ per year. What is the price of the call option? can you show this is excel