CFA CFA Level 3 Contingent Immunization — change in YTM

Contingent Immunization — change in YTM

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  • MockTurtle
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    Can you help me please with something I just don’t understand (or forgot perhaps) on page 37 of Volume 4 of the CFAI textbooks (Reading 20). There is a bit about contingent immunisation on page 36 and they discuss it with the example of a $500 million portfolio (at the beginning).
    On page 37:
    ‘If the manager invests the entire $500 million in a 4.75%, 10 year notes at par and the YTM immediately changes, what will happen to the dollar safety margin?
    If the YTM suddenly drops to 3.75%, the value of the portfolio will be $541.36…’

    Can you guide me how to get this calculation? I don’t remember all the stuff about the bond yields and YTM etc, so I’m puzzled about how they got this value from a YTM of 3.75%.

    vincentt
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    “…he manager invests the entire $500 million in a 4.75%, 10 year notes at par.”

    PV=-500
    N=20
    I/Y=4.75 / 2
    PMT= 500 * 0.0475 / 2 (since it’s par)
    FV = 500

    or leave PV off and so CPT -> PV, you’ll get -500 anyway.

    now key in I/Y = 3.75 / 2
    then CPT -> PV

    You should get 541.37

    MockTurtle
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    Got it, thanks @vincentt! I was entering the data wrong in my calculator, so got quite puzzled!

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