Annuity

Used for estimating returns on periodic investments in mutual funds etc.

If paid at the start of period,

A = P*[{(1+i)^n – 1 }/i]*(1+i)

If paid at the end of period,

A = P*[{(1+i)^n – 1 }/i]

A = Final amount
P = Installment each time
n = Total number of installments
i = Rate (in %) for period