b) The APT straight line is given by E(R;) = E(R) + [E (1) E (R)]. Suppose there are three portfolios on this straight line. Given the following information provided, answer the questions below: Mean Beta Specific Risk A 15% 0.7 0 B 21% 1.3 0 C ? 1.8 0 i. What is the slope of the APT line? (10 marks) ii. Calculate the E (R) (10 marks) iii. What is the expected rate of return on portfolio C