Answer:
b. Your portfolio has a beta equal to 1.6, and its expected return is 15%
Step-by-step explanation:
when a portfolio is given, there exist the posibility to agregate the different calculations made, this is possible using the weights of the different assets whose are part of the portfolio, so in this specifinx example the beta portfolios is calculated as 1.6*50%+1.6*50%=1.6 and the expected return is calculated using the same logic 15%*50%+15%*50%. it does not apply for deviation of the portfolio, at this point is important to see that as there is not correlation coeficient, so there will no be calculated the covariance, so at the end the standar deviation aggregated is 0%