5. Suppose the return R on a portfolio is lognormal with mean 10% and standard deviation of 20%. In other words, R = e* where x is normal with mean 10% and standard deviation of 20%. Calculate the probability of * The return being at least 5% in any given year b. A loss over the next year c. A loss over at least 2 of the next 5 years d. The value of the portfolio 10 years from now being at least 50% greater than its current value