You ante managino a portlolio of 510 militon. Your target duration is 27 years, and you can choose from fwo bonds a zeto-coupon bond. Required: 0. How much of U the zero coupon bond and (M) the perpetuity wal you hold in your portfolio? 10 o not round intermediate celculations. Round your answers to 2 decimel ploces.) b. How whi these fractions charige next yew if target durapon is now twenty wx years? (00 not round intermediate calculotions. Round your answers to 2 decimal places)