Can you please help me solve a, b, and c

1. (Single index modelk portfolio; beta) Assume the single index model holds. You own 2,000 shares of each of the following two stocks: Stock Standard deviation Beta Price per share 50% 30% S2. S15 0.8 The standard deviation of return on the market portfolio is 25%. (a) What is the beta of your portfolio? (b) What is the residual variance of return on stock A? (c) What is the standard deviation of return (%) on your portfolio? 1 (a) 1.3 (b) 0.09 (c) 38.45%