Beta of a portfolio.
The beta of four stocks --P, Q, R, and S --are 0.44, 0.73, 1.24, and 1.31, respectively. What is the beta of a portfolio with the following weights in each asset?
Weight in Stock P Weight in Stock Q
Weight in Stock R Weight in Stock S
Portfolio 1 25% 25% 25% 25%
Portfolio 2 30% 40% 20% 10%
Portfolio 3 10% 20% 40% 30%
Portfolio 1 Beta is 0.930
Stock | Weight | × beta | Portfolio beta |
P | 25% | 0.44 | 0.1100 |
Q | 25% | 0.73 | 0.1825 |
R | 25% | 1.24 | 0.3100 |
S | 25% | 1.31 | 0.3275 |
Portfolio beta | 0.930 |
Portfolio 2 beta is 0.803
Stock | Weight | × beta | Portfolio beta |
P | 30% | 0.44 | 0.1320 |
Q | 40% | 0.73 | 0.2920 |
R | 20% | 1.24 | 0.2480 |
S | 10% | 1.31 | 0.1310 |
Portfolio beta | 0.803 |
Portfolio 3 beta is 1.079
Stock | Weight | × beta | Portfolio beta |
P | 10% | 0.44 | 0.0440 |
Q | 20% | 0.73 | 0.1460 |
R | 40% | 1.24 | 0.4960 |
S | 30% | 1.31 | 0.3930 |
Portfolio beta | 1.079 |
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