Derek wants to start withdrawing at the age of 66th until 87th, therefore, the total number of withdrawals is equal to 22. (i.e 87 - 65) because we need to count the 66th withdrawal also.
Now we can use the present value of the annuity formula to find the answer:
Where,
PVA = Present value of the annuity
A = Annuity
i = Interest rate in decimal form (i.e 10% = 0.10)
n = Number of years
Therefore,
Therefore, he will need $1,693,626.54 in his retirement account on his 65th birthday.
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