Final Answer:
If Alexander invests in the U.S.-based project, the overall variance of their portfolio would be 0.0075. If Alexander invests in the Germany-based project, the overall variance of their portfolio would be 0.003025.
Step-by-step explanation:
To calculate the overall variance for each scenario, we utilize the formula for a portfolio of two assets. For the U.S.-based project, the overall variance is computed as follows:
![\[Variance_(US) = (W_(US)^2) * Var(Return_(US)) + (W_(Germany)^2) * Var(Return_(Germany)) + 2 * W_(US) * W_(Germany) * Cov(Return_(US), Return_(Germany))\]](https://img.qammunity.org/2024/formulas/business/high-school/pb0324wwdqmmo1pokgcrbyohvgoipx5o7l.png)
Given the weights \(W_{US} = 0.5\) and \(W_{Germany} = 0.5\), and the variance and covariance values provided, we substitute and solve to obtain \(Variance_{US} = 0.0075\).
For the Germany-based project, following the same formula:
![\[Variance_(Germany) = (W_(US)^2) * Var(Return_(US)) + (W_(Germany)^2) * Var(Return_(Germany)) + 2 * W_(US) * W_(Germany) * Cov(Return_(US), Return_(Germany))\]](https://img.qammunity.org/2024/formulas/business/high-school/z71zqko9cwq3nx1tmgwspq812e4og9y1qp.png)
Given the same weights but different variance and covariance values for the Germany scenario, we substitute these values to find

Therefore, the U.S.-based project results in an overall portfolio variance of 0.0075, while the Germany-based project yields an overall portfolio variance of 0.003025. This analysis indicates that the Germany-based project offers a lower overall portfolio variance, suggesting potentially lower risk compared to the U.S.-based project.