What am I doing wrong?

Discussion in 'CT1' started by Phil, Sep 11, 2006.

  1. Phil

    Phil Member

    I'm sure its me being stupid but can someone spot my error please with Q1.29 part (iii) of the Q&A Bank.

    The interest rate is 12% p.a. convertible monthly
    --> i = 12.68250301%

    In part (i) it gives you a few annuities and you have to work out their combined Present Value. The solution given is £5,487

    Part (ii) then says that there is a level annuity payable continuously for 10 years and having the same Present Value as the annuties in Part (i) i.e. £5,487

    Part (iii) Then asks what is the Accumulated Value after 7 years of the level annuity payable continuously

    I can't see why it is not the PV rolled up for 7 years
    i.e £5,487 x 1.1268250301^7 = £12,656.99

    The solution given is £10,287


    Thanks
     
  2. Abi

    Abi Member

    Hi Phil

    When you roll up the PV, you are including the monies earned in years 7-10.

    For the accumulation in year 7 you need to do a roll-up of the PV of a 7-year continuous annuity.

    Hope that helps.
    Good luck tomorrow.
     
  3. Phil

    Phil Member

    Thank you Abi

    Thank goodness I came across this serious flaw in my thinking tonight
     
  4. Monkey_Mike

    Monkey_Mike Member

    howdy....

    you first solve

    5487 = Xa_bar_10

    =>

    X = 939.978

    then the PV of 7 years worth of this is

    PV = 939.978a_bar_7

    then you can roll this up...


    4459.508*(1.1268250)^7 = 10287

    if you try rolling up the 5487, this like the earlier reply indicated, includes the 8th 9th and 10th payments, you could roll up like you did

    $12,656.99

    then subtract the present value of a 3 year continual annuity

    939.978*a_bar_3 = $2370.138

    $12,656.99 - $2370.138 = $10,287

    hope this helps :)

    good luck
     
  5. Monkey_Mike

    Monkey_Mike Member

    phil, sent you a pm dude,

    didnt realise you'd sent me one, sorry
     

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