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formula is future worth of an annuity as shown below.

FV (Annuity) means future value of the annuity.
r = interest rate per period
n = number of periods
pmt = payment per period
the assumption here is that the period is in years.
payment is made at the end of each year.
interest rate is compounded yearly.
note:
interest rate is the % interest divided by 100%.
example:
if % interest = 15%
then interest rate = .15