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percentage
In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%", or the abbreviations "pct.", "pct"; sometimes the abbreviation "pc" is also used.〔http://www.telegraph.co.uk/finance/economics/11329769/Eurozone-officially-falls-into-deflation-piling-pressure-on-ECB.html〕 A percentage is a dimensionless number (pure number).
== Examples ==
For example, 45% (read as "forty-five percent") is equal to , or 0.45. A related system which expresses a number as a fraction of 1,000 uses the terms "per mil" and "millage". Percentages are used to express how large or small one quantity is relative to another quantity. The first quantity usually represents a part of, or a change in, the second quantity. For example, an increase of $0.15 on a price of $2.50 is an increase by a fraction of = 0.06. Expressed as a percentage, this is therefore a 6% increase. While percentage values are often between 0 and 100 there is no restriction and one may, for example, refer to 111% or −35%, especially for percent changes and comparisons.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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