Final answer:
The portfolio's beta can be calculated by finding the weighted average of the individual betas based on the investment amounts.
Step-by-step explanation:
To calculate the portfolio's beta, we need to find the weighted average of the individual betas based on the investment amounts.
The formula to calculate the portfolio beta is:
Portfolio Beta = (Amount Invested in Stock A x Beta of Stock A) + (Amount Invested in Stock B x Beta of Stock B) / Total Amount Invested in the Portfolio
For this portfolio, the calculation would be:
Portfolio Beta = ($45,000 x 0.4) + ($65,000 x 1.7) / ($45,000 + $65,000)
After calculating, the portfolio's beta is approximately 1.18.