Formula
If investment is made at the beginning,
Future value of DA = ai ( 1 + i )ⁿ

If investment is through period of payments,
Future value of DA = { a ( ( 1 + i )ⁿ-1)} / i


Where,
DA = Deferred Annunity,
a = Amount,
i = Expected rate of return,
n = Time period.

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