1) A firm has the following investment portfolio which it has held throughout the year. The yield for each investment is provided. Calculate the portfolio return. (Hint: first calculate and add the dollar return for each investment, then divide by the total amount invested) SECURITY Amount Invested Yield $ $ A B IC Total 100,000 250,000 100,000 450,000 6.05% 6.75% 6.65% ulus