The following stocks are available for consideration Stocks N R 25 25 a 12% 8 P 10 5 15 12 A=0.8. Ar=-0.8 0. 1. A 0.8-1 Calculate the return and risk of portfolio that is made up of the following combinations (a) 50% in N and 50% in O (b) 30% in N, 30% in 0 and 40% in P (c) 25% in N, 25% in 0,30% in P and 20% in Q (d) Which combination is the best investment in terms of returns per unit risk