The duration of zero coupon bonds are equals to its maturity period because zero-coupon bond has no cash flow until maturity.
Therefore duration of zero coupon bond = 5 years
The perpetual bonds have no maturity period; therefore duration of perpetuity bond is calculated in following manner
Duration of perpetuity bond = (1 + yield)/yield
= (1+2%)/2% = 1.02/0.02 = 51 years
Duration of portfolio is its weightage average.
Total investment amount of portfolio = $1.0 million
Assume that x is invested in zero coupon bonds
Therefore (1-x) will be invested in perpetuity bonds
The target duration = 22 years
Therefore,
The target duration of portfolio = weight of zero coupon bond in portfolio * duration of zero coupon bond + weight of perpetuity bond in portfolio * duration of perpetuity bond
Or 22 = x * 5 + (1-x) * 51
Or 22 = 5 x + 51 – 51 x
Or (51 -22) = 51 x – 5 x
Or x = (51 -22)/ (51 -5) = 29/46 = 0.6304 or 63.04%
Therefore 63.04% invested in zero coupon bonds
And 1 – x = 1 - 0.6304 = 0.3696 or 36.96% invested in perpetuity bond
A in perpetuity NOT correct You are managing a portfolio of $1.0 million. Your target duration...
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