Final answer:
To calculate the new portfolio beta, multiply the beta of each component by the proportion of the portfolio value it represents.
Step-by-step explanation:
To calculate the new portfolio beta, we need to multiply the beta of each component in the portfolio by the proportion of the portfolio value it represents. Given that 91% of the money is in the old portfolio with a beta of 1.63, and 9% is in a stock with a beta of 0.60, we can calculate the new portfolio beta as follows:
New Portfolio Beta = (91% x 1.63) + (9% x 0.60) = 1.482 + 0.054 = 1.536.
Therefore, the new portfolio beta is 1.536.