Three securities have the following expected returns and beta:

Securities	Return	Beta
A	10%	0.65
B	18%	1.37
C	25%	0.22

a) Calculate the expected return of a portfolio if all the securities are held equally. b) Given the standard deviation for the securities A, B, and C is 12%, 14% and 18% while its covariance is 60, 20, and -30 respectively, estimate the standard deviation of this portfolio. c) Based on the risk-return relation, redesign the securities holding proportion in the manner that it rebalances the portfolio risk to maximize its return.