a. | ||
Calculation of expected return on portfolio | ||
Expected return on portfolio | (0.50*11.4%)+(0.5*3.5%) | |
Expected return on portfolio | 0.057+0.0175 | |
Expected return on portfolio | 7.45% | |
b. | ||
The beta of portfolio is weighted average beta of assets in the portfolio | ||
For risk free asset the beta of portfolio is 0 | ||
Beta of portfolio | Beta of stock*Weight of stock + Beta of risk free asset*Weight of risk free asset | |
Let weight of stock be x and thus weight of risk free asset is (1-x) | ||
Beta of portfolio | Beta of stock*x + Beta of risk free asset*(1-x) | |
0.7 | (1.15x)+(0*(1-x)) | |
0.7 | 1.15x | |
x | 0.7/1.15 | |
x | 0.6087 | |
Weight of stock | 0.6087 | |
Weight of risk free asset | 0.3913 | 1-0.6087 |
c. | ||
Using the expected return of portfolio we can calculate weight of each asset and then the beta of portfolio | ||
Let weight of stock be x and thus weight of risk free asset is (1-x) | ||
Expected return of portfolio | Weight of stock*Return on stock + Weight of risk free asset*Return on risk free asset | |
9% | 11.4%x + ((1-x)*3.5%) | |
0.09 | 0.114x + 0.035 - 0.035x | |
0.09-0.035 | 0.079x | |
0.055 | 0.079x | |
x | 0.055/0.079 | |
x | 0.6962 | |
Weight of stock | 0.6962 | |
Weight of risk free asset | 0.3038 | 1-0.6962 |
Beta of portfolio | (0.6962*1.15)+(0.3038*0) | |
Beta of portfolio | 0.80 | |
d. | ||
The beta of portfolio is weighted average beta of assets in the portfolio | ||
For risk free asset the beta of portfolio is 0 | ||
Beta of portfolio | Beta of stock*Weight of stock + Beta of risk free asset*Weight of risk free asset | |
Let weight of stock be x and thus weight of risk free asset is (1-x) | ||
Beta of portfolio | Beta of stock*x + Beta of risk free asset*(1-x) | |
2.3 | (1.15x)+(0*(1-x)) | |
2.3 | 1.15x | |
x | 2.3/1.15 | |
x | 2.0000 | |
Weight of stock | 2.0000 | |
Weight of risk free asset | -1.0000 | 1-0.6087 |
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