Posted by Anonymous on Sunday, July 31, 2011 at 6:20pm.
First -- there's no guarantee today that the investment rate is or will ever be 6% again.
Second, option C. is out if Sally is elderly.
What do you think?
Assume a constant investment rate of 6% indefinitely, and that Sally has a life expectancy of over 20 years.
Also, assume that the winnings are deposited the money in a trust fund independent of the lottery company.
A.
Future value at the end of 8 years
=10M*1.06^8
=15.938M$
Future value at the end of 20 years
=32.071M$
B. future value of 8 yearly payments
=2M$*(1.06^8-1)/(1.06-1)
=19.795M$ > 15.93 M$
i.e. better choice than A.
C. Future value of 20 yearly payments of 1.5M$
=1.5*(1.06^20-1)/(1.06-1)
=55.178M$ > 32.07M$
i.e. better choice than A.
Now compare B and C by investing the future value of B (after 8 years) for the following 12 years at 6%.
Future value of option B after 12 more years
= 19.795M$ * 1.06^12
= 39.831M$ < 55.178M$
Thus option C is by far the most advantageous, assuming all the pre-conditions are met.
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