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The interest is the cost of money and is measured by the interest rate, where
interest rate = cost of having money available for use
The interest rate is a percentage that is periodically added to an amount of money over a specified length of time. If the money is borrowed the interest rate is percentage of the borrowed amount that is paid to the borrower as a compensation for the use of the borrowed property.
Interest reflects that
The future value of a present amount can be expressed as
F = P (1 + i)n = (1)
where
F = future value
P = present value
i = interest rate per period
n = number of interest periods
The accumulated value of an amount of present value 1 and an interest rate of 10% to 10 year can be expressed like
| Year | Accumulated Value |
| 0 | 1 |
| 1 | 1.1 |
| 2 | 1.21 |
| 3 | 1.33 |
| 4 | 1.46 |
| 5 | 1.61 |
| 6 | 1.77 |
| 7 | 1.94 |
| 8 | 2.14 |
| 9 | 2.36 |
| 10 | 2.59 |
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