Another common example is the lump sum required for retirement. To solve this example we need
to determine the amount of retirement income desired by the individual. This would be an annuity
due We need to determine the number of periods for which this payment is to be received. We
need to estimate his life expectancy. During this period his retirement fund will also be able to earn
interest or a rate of return from the retirement funds.
For example, let us say the individual desires an income (annuity due) of 50,000 a year. Let us say
he expects his life expectancy to be 25 years from his retirement. His investment rate of return is
8%p.a. How much must he accumulate for his retirement?