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# percentage

A percentage is a ratio expressed in terms of a unit being 100. A percentage is usually denoted by the symbol “%.” For example, $20%$ of $\$700.47$ is $\$175.12$ (using fixed point arithmetic to two decimal places for display).

On most calculators, one sure way to calculate a percentage is by entering a decimal point before the desired percentage and multiplying that by the amount one wishes to calculate the percentage of. Some calculators have a percentage key.

When tipping at most restaurants in the United States, it is customary to tip 15% of the check to the waiter for parties of as much as four people. One common shortcut is to divide by 10 (by moving the decimal point to the left) and then add half of that amount.

Note that the percentage symbol % (Shift-5 in most American keyboard layouts) is overloaded in TeX as a comment start indicator and in Mathematica as a shortcut for referring to the previous output.

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00A05*no label found*

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## Comments

## Barnstar of Excellence for PrimeFan: anti-elitist embracing ...

Just as PrimeFan has been awarded a Barnstar of Excellence in Wikipedia, so too I award him one for PlanetMath. His espousal of elementary mathematics and integer literals is an excellent expression of American patriotism.

Currently, the United States lags behind most countries in mathematics and science. I blame the elitism of the boys' club for this, which keeps women and ethnic minorities out of the sciences and mathematics by means of aggressive knowledge encryption, mystification of middle-level mathematical topics and repudiation of elementary math. Many men who achieve an understanding of advanced mathematical topics wish those of undesirable minorities from joining their pantheon.

PrimeFan has done excellent work in counteracting this elitist tendency, which would certainly hurt America as women increasingly outnumber men and need to be educated in math and science in order to compete in the global marketplace.