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  2. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    To calculate a percentage of a percentage, convert both percentages to fractions of 100, or to decimals, and multiply them. For example, 50% of 40% is: ⁠ 50 / 100 ⁠ × ⁠ 40 / 100 ⁠ = 0.50 × 0.40 = 0.20 = ⁠ 20 / 100 ⁠ = 20%. It is not correct to divide by 100 and use the percent sign at the same time; it would literally imply ...

  3. Rate of return - Wikipedia

    en.wikipedia.org/wiki/Rate_of_return

    The return, or the holding period return, can be calculated over a single period.The single period may last any length of time. The overall period may, however, instead be divided into contiguous subperiods. This means that there is more than one time period, each sub-period beginning at the point in time where the previous one ended. In such a case, where there are

  4. Formula for primes - Wikipedia

    en.wikipedia.org/wiki/Formula_for_primes

    In number theory, a formula for primes is a formula generating the prime numbers, exactly and without exception. Formulas for calculating primes do exist; however, they are computationally very slow. A number of constraints are known, showing what such a "formula" can and cannot be.

  5. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    More formulas of this nature can be given, as explained by Ramanujan's theory of elliptic functions to alternative bases. Perhaps the most notable hypergeometric inversions are the following two examples, involving the Ramanujan tau function τ {\displaystyle \tau } and the Fourier coefficients j {\displaystyle \mathrm {j} } of the J-invariant ...

  6. Mass fraction (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Mass_fraction_(chemistry)

    The mass fraction of an element in a compound can be calculated from the compound's empirical formula [2] or its chemical formula. [3] Terminology.

  7. Do you need full-coverage car insurance? What it is, when it ...

    www.aol.com/finance/full-coverage-car-insurance...

    Use this formula to make your decision: If your car’s value minus your deductible is higher than 10 times your premium, then full coverage is likely worth keeping. [car's value deductible ...

  8. Compound interest - Wikipedia

    en.wikipedia.org/wiki/Compound_interest

    A formula that is accurate to within a few percent can be found by noting that for typical U.S. note rates (< % and terms =10–30 years), the monthly note rate is small compared to 1. r << 1 {\displaystyle r<<1} so that the ln ⁡ ( 1 + r ) ≈ r {\displaystyle \ln(1+r)\approx r} which yields the simplification:

  9. 5 ways to tell if you’re on track for retirement — and 5 ...

    www.aol.com/finance/5-ways-tell-track-retirement...

    Bankrate’s retirement calculator even lets you input different rates of return on your investments and accounts for estimated annual salary increases. 4. Map out your retirement budget.