Let i be a random variable with the following discrete distribution: i is 5% with probability 1/2 ,

10% with probability 1/4 and -4% with probability 1/4

Consider a 2-year investment, where you invest 100 at the start for the first year and 50 at the start of the second year. You can choose between two types of investments, type A and type B. In type A the annual effective rates for years 1 and 2 are given by two independent random variables i1,i2, identically distributed like i. In type B the annual effective rates are the same rate i.

(a) Which investment t ype would you choose if you wanted to maximise the expected accumu- late value after 2 years ? (You must motivate your answer with mathematical calculations)

(b) Which investment type would you choose if you wanted to minimise your risk after 2 years? Assume that risk is measured as the variance of your accumulated value. (You must motivate your answer with mathematical calculations)