(2) Assuming that both variables x and y defined in problem (1) can only take integer values, solve the above question again using Branch-Bound solution method (10 points). 2. A portfolio manager in charge of a bank portfolio has $10 million to invest. The securities identified as alternative options, together with the related data including their quality ratings, maturities, and yields, are shown below: Bond Name Bond Type Quality Index Years to Maturity After tax yield (%) A Municipal 2 9 4.3 B Agency 2 15 2.7 Government 1 4 2.5 D Government 1 3 2.2 E Municipal 2 4.5 5 (2) Assuming that both variables x and y defined in problem (1) can only take integer values, solve the above question again using Branch-Bound solution method (10 points). 2. A portfolio manager in charge of a bank portfolio has $10 million to invest. The securities identified as alternative options, together with the related data including their quality ratings, maturities, and yields, are shown below: Bond Name Bond Type Quality Index Years to Maturity After tax yield (%) A Municipal 2 9 4.3 B Agency 2 15 2.7 Government 1 4 2.5 D Government 1 3 2.2 E Municipal 2 4.5 5