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2. What is compound interest? How compounding works to ... - AOL

   www.aol.com/finance/what-is-compound-interest...

   Here’s what the letters represent: A is the amount of money in your account. P is your principal balance you invested. R is the annual interest rate expressed as a decimal. N is the number of ...

3. Compound interest - Wikipedia

   en.wikipedia.org/wiki/Compound_interest

   Richard Witt's book Arithmeticall Questions, published in 1613, was a landmark in the history of compound interest. It was wholly devoted to the subject (previously called anatocism), whereas previous writers had usually treated compound interest briefly in just one chapter in a mathematical textbook. Witt's book gave tables based on 10% (the ...

4. Rule of 72 - Wikipedia

   en.wikipedia.org/wiki/Rule_of_72

   The rule number (e.g., 72) is divided by the interest percentage per period (usually years) to obtain the approximate number of periods required for doubling. Although scientific calculators and spreadsheet programs have functions to find the accurate doubling time, the rules are useful for mental calculations and when only a basic calculator ...

5. How Much Do I Need To Retire? Retirement Calculator and Tips

   www.aol.com/finance/much-retire-retirement...

   A lot goes into figuring out how much money you need to retire. In the end, the amount you need to retire depends as much on the amount you spend as it does on the amount you have saved.

6. Financial calculator - Wikipedia

   en.wikipedia.org/wiki/Financial_calculator

   A financial calculator or business calculator is an electronic calculator that performs financial functions commonly needed in business and commerce communities [1] (simple interest, compound interest, cash flow, amortization, conversion, cost/sell/margin, depreciation etc.).

7. 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 ...