Compound Interest
The fee paid to use another’s money is called interest. It is usually computed as a percent (called interest rate) of the principal over a given period of time. If, at the end of a payment period, the interest due is reinvested at the same rate, then the interest earned as well as the principal will earn interest during the next payment period. Interest paid on interest reinvested is called compound interest and may be calculated using the following compound interest formula:
If a principal P (present value) is invested at an annual rate r (expressed as a decimal) compounded m times a year, then the amount A (future value) in the account at the end of t years is given by
For given r and m, the amount A is equal to the principal P multiplied by the exponential function bt, where b = (1 + r/m)m .
Example Compound Growth If $1,000 is invested in an account paying 10% compounded monthly, how much will be in the account at the end of 10 years? Compute the answer to the nearest cent.
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