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  2. Forward rate - Wikipedia

    en.wikipedia.org/wiki/Forward_rate

    To extract the forward rate, we need the zero-coupon yield curve.. We are trying to find the future interest rate , for time period (,), and expressed in years, given the rate for time period (,) and rate for time period (,).

  3. Proper time - Wikipedia

    en.wikipedia.org/wiki/Proper_time

    The proper time interval between two events on a world line is the change in proper time, which is independent of coordinates, and is a Lorentz scalar. [1] The interval is the quantity of interest, since proper time itself is fixed only up to an arbitrary additive constant, namely the setting of the clock at some event along the world line.

  4. Annual percentage rate - Wikipedia

    en.wikipedia.org/wiki/Annual_percentage_rate

    The APR is used to find compound and simple interest rates. APR is also an abbreviation for "Annual Principal Rate" which is sometimes used in the auto sales in some countries where the interest is calculated based on the "Original Principal" not the "Current Principal Due", so as the Current Principal Due decreases, the interest due does not.

  5. Savings interest rates today: Best accounts still paying up ...

    www.aol.com/finance/savings-interest-rates-today...

    Let's say you invest $10,000 into an account that pays 3% in simple interest. After three years, you’d have earned $900 in interest — $300 each year — for a total of $10,900 in your account.

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  7. 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 ...

  8. Savings interest rates today: Get in front of the Fed's next ...

    www.aol.com/finance/savings-interest-rates-today...

    Simple interest vs. compound interest ... announced it was lowering the federal funds target interest rate by 25 basis points to a range of 4.50% to 4.75% — two months after its jumbo half-point ...

  9. 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.).