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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 is available. [2] These rules apply to exponential growth and are therefore used for compound interest as opposed to simple interest calculations.
The day count is also used to quantify periods of time when discounting a cash-flow to its present value. When a security such as a bond is sold between interest payment dates, the seller is eligible to some fraction of the coupon amount. The day count convention is used in many other formulas in financial mathematics as well.
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.).
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.
An amortization calculator is used to determine the periodic payment amount due on a loan (typically a mortgage), based on the amortization process. [1]The amortization repayment model factors varying amounts of both interest and principal into every installment, though the total amount of each payment is the same.
Simple interest is calculated only on the principal amount, or on that portion of the principal amount that remains. It excludes the effect of compounding. Simple interest can be applied over a time period other than a year, for example, every month. Simple interest is calculated according to the following formula:
t is the overall length of time the interest is applied (expressed using the same time units as n, usually years). The total compound interest generated is the final amount minus the initial principal, since the final amount is equal to principal plus interest: [ 11 ]
The accumulation function a(t) is a function defined in terms of time t expressing the ratio of the value at time t (future value) and the initial investment (present value). It is used in interest theory. Thus a(0)=1 and the value at time t is given by: = ().