Q7. The volatility of a stock price is 30% per annum. What is the standard deviation of the percentage price change in one trading day? Q8. Calculate the price of a three-month European put option on a non-dividend-paying stock using the Black -Scholes model with a strike price of $50 when the current stock price is $50, the risk-free interest rate is 10% per annum, and the volatility is 30% per annum. 09. What difference does it make to your calculations in the previous problem (Q8) if a dividend of $1.50 is expected in two months? Q10. What is the price of a European call option using the Black -Scholes model on a non- dividend paying stock when the stock price is $52, the strike price is $50, the risk-free interest rate is 12% per annum, the volatility is 30% per annum, and the time to maturity is three months? At what future stock price will the buyer of the call option breakeven? Q11. What is the price of a European put option on a non-dividend-paying stock using the Black -Scholes model when the stock price is $69, the strike price is $70, the risk-free interest rate is 5% per annum, the volatility is 35% per annum, and the time to maturity is six months? At what future stock price will the buyer of the put option breakeven