To create a portfolio with a duration of 4 years using a 5 year zero-coupon bond and a 3 year zero-coupon bond, one would have to invest of the portfolio value in the 5 year zero-coupon bond.
A. 50%
B. 55%
C. 60%
D. 75%
Given about a portfolio,
Duration = 4 years
it consist of a 5 year zero-coupon bond and a 3 year zero-coupon bond.
duration of the portfolio is weighted average duration of its bonds.
Duration of a zero-coupon bond is equal to its years to maturity
So, duration of 5 years zero-coupon bond = 5 years
and duration of 3 year zero-coupon bond = 3 years
let weight of 5 year bond be w, then weight of 3 year bond is (1-w)
So, duration of portfolio = Wa*Da + Wb*Db
=> 4 = w*5 + (1-w)*3
=> w = 0.5 or 50%
So, weight of 5 year bond in portfolio is 50%
Option A is correct.
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