Given annuity of ` 100 amounts to ` 3137.12 at 4.5% p.a C. I. The numb...
Explanation of Annuity Calculation
An annuity is a financial product that pays a fixed amount of money to an individual over a certain period of time. In this case, the annuity amount is ` 100 and it is compounded annually at a rate of 4.5% per annum. The total amount of the annuity after a certain number of years is ` 3137.12.
Calculation of the Number of Years
The formula for calculating the future value of an annuity is:
FV = PMT x [(1 + r)n - 1] / r
Where:
- FV is the future value of the annuity
- PMT is the annuity payment
- r is the interest rate
- n is the number of years
Substituting the given values in the formula:
3137.12 = 100 x [(1 + 0.045)n - 1] / 0.045
Simplifying the equation:
3137.12 x 0.045 = 100 x [(1 + 0.045)n - 1]
141.1664 = [(1 + 0.045)n - 1]
[(1 + 0.045)n - 1] = 141.1664
[(1 + 0.045)n] = 142.1664
n log(1 + 0.045) = log(142.1664)
n = log(142.1664) / log(1 + 0.045)
n = 16.09 years (approx.)
Conclusion
Therefore, it will take approximately 16.09 years for an annuity of ` 100 compounded annually at a rate of 4.5% per annum to reach a total amount of ` 3137.12.