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  2. Return on investment - Wikipedia

    en.wikipedia.org/wiki/Return_on_investment

    Return on investment. Return on investment ( ROI) or return on costs ( ROC) is the ratio between net income (over a period) and investment (costs resulting from an investment of some resources at a point in time). A high ROI means the investment's gains compare favourably to its cost. As a performance measure, ROI is used to evaluate the ...

  3. Matrix (chemical analysis) - Wikipedia

    en.wikipedia.org/wiki/Matrix_(chemical_analysis)

    In chemical analysis, matrix refers to the components of a sample other than the analyte [1] of interest. The matrix can have a considerable effect on the way the analysis is conducted and the quality of the results are obtained; such effects are called matrix effects. [2] For example, the ionic strength of the solution can have an effect on ...

  4. How to calculate interest on a loan: Tools to make it easy

    www.aol.com/finance/calculate-interest-loan...

    You can calculate your total interest by using this formula: Principal loan amount x interest rate x loan term = interest. For example, if you take out a five-year loan for $20,000 and the ...

  5. Signal-to-noise ratio - Wikipedia

    en.wikipedia.org/wiki/Signal-to-noise_ratio

    Signal-to-noise ratio ( SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background noise. SNR is defined as the ratio of signal power to noise power, often expressed in decibels. A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise.

  6. Amortization calculator - Wikipedia

    en.wikipedia.org/wiki/Amortization_calculator

    Amortization calculator. An amortization calculator is used to determine the periodic payment amount due on a loan (typically a mortgage ), based on the amortization process. 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.

  7. Thermodynamic equations - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_equations

    One of the fundamental thermodynamic equations is the description of thermodynamic work in analogy to mechanical work, or weight lifted through an elevation against gravity, as defined in 1824 by French physicist Sadi Carnot. Carnot used the phrase motive power for work. In the footnotes to his famous On the Motive Power of Fire, he states ...

  8. Mello-Roos - Wikipedia

    en.wikipedia.org/wiki/Mello-Roos

    The Community Facilities Act was a law enacted by the California State Legislature in 1982. [2] The name Mello-Roos is derived from its co-authors, Senator Henry J. Mello (D-Watsonville) and Assemblyman Mike Roos (D-Los Angeles). When Proposition 13 passed in California in 1978, it limited the property tax rate and the ability of local ...

  9. Present value interest factor - Wikipedia

    en.wikipedia.org/wiki/Present_value_interest_factor

    In economics, Present value interest factor, also known by the acronym PVIF, is used in finance theory to refer to the output of a calculation, used to determine the monthly payment needed to repay a loan. The calculation involves a number of variables, which are set out in the following description of the calculation: Formula. Let:

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