Calculate the after-tax return of a(n) 13.29 percent, 20-year, A-rated corporate bond for an investor in the 15percent marginal tax bracket. Compare this yield to a(n) 12.45 percent, 20-year, A-rated, tax-exempt municipal bond, and explain which alternative is better. Repeat the calculations and comparison for an investor in the 33 percent marginal tax bracket. Question content area bottom Part 1 The after-tax return of the 13.29%, 20-year, A-rated corporate bond for an investor in the 15% marginal tax bracket is %. (Round to two decimal places.)