Percentage aus Wikipedia.
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Percentage - Wikipedia, the free encyclopedia
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Percentage
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Wikibooks. (August 2011)
In
mathematics, a percentage is a way of expressing a number as a
fraction of 100 (per centum meaning ?per hundred? in Latin). It is often denoted using the
percent sign, ?%?, or the abbreviation ?pct?. For example, 45% (read as ?forty-five percent?) is equal to
45/100, or
0.45.
Percentages are used to express how large/small one quantity is, relative to another quantity. The first quantity usually represents a part of, or a change in, the second quantity, which should be greater than zero. For example, an increase of $ 0.15 on a price of $ 2.50 is an increase by a fraction of 0.15/2.50 = 0.06. Expressed as a percentage, this is therefore a 6% increase.
Although percentages are usually used to express numbers between zero and one, any
dimensionless proportionality can be expressed as a percentage. For instance, 111% is 1.11 and ?0.35% is ?0.0035. Although this is technically inaccurate as per the definition of percent, an alternative wording in terms of a change in an observed value is ?an increase/decrease by a factor of...??
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