Final answer:
The weighted average of price relatives for the investment portfolio is option b) 123.47. The percentage change in the investment portfolio value based on the price index is option c) 33.21%.
Step-by-step explanation:
To calculate the weighted average of price relatives (index) for the investment portfolio, you'd sum the products of the price relatives and their respective weights. In this case, the weighted average can be computed by averaging the price relatives, resulting in 123.47.
For the percentage change in the investment portfolio value based on the price index, the formula involves taking the difference between the final and initial index values, dividing it by the initial index value, and then multiplying by 100 to express it as a percentage. The calculated percentage change is 33.21%.
These calculations and choices reflect the mathematical determination of the weighted average and percentage change in the investment portfolio value based on the given price index data.
Therefore,the correct Options are Options b) b) 123.47 and c) 33.21%.