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

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

   The final rule for retirement savings is the 80% rule, or saving enough to replace 80% of your pre-retirement income. So if you currently earn $100,000 per year, this rule says you’ll need ...

4. 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 ...

5. 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 ...

6. Rule of 78s - Wikipedia

   en.wikipedia.org/wiki/Rule_of_78s

   Also known as the "Sum of the Digits" method, the Rule of 78s is a term used in lending that refers to a method of yearly interest calculation. The name comes from the total number of months' interest that is being calculated in a year (the first month is 1 month's interest, whereas the second month contains 2 months' interest, etc.).

7. I’m a Retirement Planner: Here’s How To Calculate Your FIRE ...

   www.aol.com/finance/m-retirement-planner...

   Against that backdrop, Kates recommended another way to calculate your number: Multiply non-health insurance expenses by 28 — roughly equal to a 3.5% withdrawal rate — multiply expected health ...