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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, etc.).
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.
A simple fraction (as with 12/78) consists of a numerator (the top number, 12 in the example) and a denominator (the bottom number, 78 in the example). The denominator of a Rule of 78s loan is the sum of the integers between 1 and n, inclusive, where n is the number of payments.
The term should not be confused with simple interest (as opposed to compound interest) which is not compounded. The effective interest rate is always calculated as if compounded annually. The effective rate is calculated in the following way, where r is the effective rate, i the nominal rate (as a decimal, e.g. 12% = 0.12), and n the number of ...
The effective interest rate is calculated as if compounded annually. The effective rate is calculated in the following way, where r is the effective annual rate, i the nominal rate, and n the number of compounding periods per year (for example, 12 for monthly compounding): [1]
To determine future value (FV) using simple interest (i.e., without compounding): = (+) where PV is the present value or principal, t is the time in years (or a fraction of year), and r stands for the per annum interest rate. Simple interest is rarely used, as compounding is considered more meaningful [citation needed].
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