The formula is given by:
\[A = P \times \left(1 + r\right)^n + P \times \left(1 + r\right)^{n-1} + \ldots + P \times \left(1 + r\right)^0\]
where:
- \(A\) is the future value of the annuity,
- \(P\) is the amount of each payment,
- \(r\) is the interest rate per
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