Currently you have $6,000 in a portfolio with a beta of 1.4. If you invest an additional $4,000 in a stock, what will the beta of the stock have to be to make your portfolio beta equal to 1.24?
Amount in the existing portfolio = $ 6000
Amount in the additional stock = $ 4000
Weight of the existing portfolio = 6000 / (6000 + 4000) = 0.6
Weight of the additional stock = 4000 / (6000 + 4000) = 0.4
Portfolio Beta = weight of existing portfolio * Beta of portfolio + weight of additional stock * Beta of stock
or , 1.24 = 0.6 * 1.4 + 0.4* Beta of stock
= 0.84 + 0.4 * Beta of stock
Hence Beta of stock = (1.24 - 0.84) / 0.4
= 0.40/0.4
= 1
The beta of stock =1
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