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20 September, 08:30

You own a portfolio that has four stocks: A, B, C, and D. The portfolio has 50% of your money in stock A, 10% in B, 15% in C, and 25% in D. The betas of stocks A to C are 0.83, 1.50, and 1.42, respectively. If the portfolio beta is 1.6, what is the beta of stock D?

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  1. 20 September, 12:06
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    WB = BA (WA) + BB (WB) + BC (WC) + BD (WD)

    1.6 = 0.83 (0.5) + 1.50 (0.1) + 1.42 (0.15) + BD (0.25)

    1.6 = 0.415 + 0.15 + 0.213 + 0.25BD

    1.6 = 0.778 + 0.25BD

    1.6-0.778 = 0.25BD

    0.822 = 0.25BD

    BD = 0.822/0.25

    BD = 3.288

    Explanation: The question relates to Beta of a portfolio. The Beta of a portfolio is the aggregate of Beta of each stock multiplied by the weight of each stock. The Beta of stock D was not given, thus, it becomes the subject of the formula.
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