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if Steve adds the new stock to his portfolio, then, the portfolio's new beta will be 1.6.
The Beta of Portfolio equals the Weighted Average because the weights are based on the market value of each stock.
Given Information
Beta of the portfolio = 1.4
Value of the Portfolio = $80,000
New Stock Beta = 2.4
Stock Value = $20,000
- The formula for Beta of the New Portfolio is [(Existing Portfolio Beta x Existing Portfolio Value) + (New Stock Beta x New Stock Beta)] / Existing Value of Portfolio + Value of New Stock
Beta of the New Portfolio = ($80,000 x 1.4 + $20,000 x 2.4) / $80,000 + $20,000
Beta of the New Portfolio = ($112,000 + $48,000) / $100,000
Beta of the New Portfolio = 160,000 / 100,000
Beta of the New Portfolio = 1.6
Therefore, in conclusion, if Steve adds the new stock to his portfolio, then, the portfolio's new beta will be 1.6.
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