Problem 11-19 You are managing a portfolio of $1.5 million. Your target duration is 12 years, and you can choose from two bonds: a zero-coupon bond with maturity 10 years, and a perpetuity, each currently yielding 8%. a. How much of each bond will you hold in your portfolio? (Do not round intermediate calculations. Round your answers to 2 decimal places.) % Zero-coupon bond Perpetuity bond % b. How will these fractions change next year if target duration is now eleven years? (Do not round intermediate calculations. Round your answers to 2 decimal places.) % Zero-coupon bond Perpetuity bond %