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  2. Rule of 72 - Wikipedia

    en.wikipedia.org/wiki/Rule_of_72

    It provides a good approximation for annual compounding, and for compounding at typical rates (from 6% to 10%); the approximations are less accurate at higher interest rates. For continuous compounding, 69 gives accurate results for any rate, since ln(2) is about 69.3%; see derivation below. Since daily compounding is close enough to continuous ...

  3. Annual percentage yield - Wikipedia

    en.wikipedia.org/wiki/Annual_percentage_yield

    This is a reasonable approximation if the compounding is daily. Also, a nominal interest rate and its corresponding APY are very nearly equal when they are small. For example (fixing some large N), a nominal interest rate of 100% would have an APY of approximately 171%, whereas 5% corresponds to 5.12%, and 1% corresponds to 1.005%.

  4. Effective interest rate - Wikipedia

    en.wikipedia.org/wiki/Effective_interest_rate

    The effective interest rate (EIR), effective annual interest rate, annual equivalent rate (AER) or simply effective rate is the percentage of interest on a loan or financial product if compound interest accumulates in periods different than a year. [1] It is the compound interest payable annually in arrears, based on the nominal interest rate ...

  5. Compound interest - Wikipedia

    en.wikipedia.org/wiki/Compound_interest

    The force of interest is less than the annual effective interest rate, but more than the annual effective discount rate. It is the reciprocal of the e -folding time. A way of modeling the force of inflation is with Stoodley's formula: δ t = p + s 1 + r s e s t {\displaystyle \delta _{t}=p+{s \over {1+rse^{st}}}} where p , r and s are estimated.

  6. How To Calculate Interest in a Savings Account - AOL

    www.aol.com/finance/calculate-interest-savings...

    The average savings account annual percentage yield in April 2023 is only 0.39%. This number includes low interest rates from traditional banks as well as higher savings rates from online banks and...

  7. Amortization calculator - Wikipedia

    en.wikipedia.org/wiki/Amortization_calculator

    Converting an annual interest rate (that is to say, annual percentage yield or APY) to the monthly rate is not as simple as dividing by 12; see the formula and discussion in APR. However, if the rate is stated in terms of "APR" and not "annual interest rate", then dividing by 12 is an appropriate means of determining the monthly interest rate.

  8. Interest Compounded Daily vs. Monthly: Which Is ... - AOL

    www.aol.com/news/interest-compounded-daily-vs...

    Savings accounts have an interest rate and an annual percentage yield. The APY reflects the rate of return you can expect on a savings account over the course of a year when compound interest is ...

  9. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    The notion of doubling time dates to interest on loans in Babylonian mathematics. Clay tablets from circa 2000 BCE include the exercise "Given an interest rate of 1/60 per month (no compounding), come the doubling time." This yields an annual interest rate of 12/60 = 20%, and hence a doubling time of 100% growth/20% growth per year = 5 years.