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.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. A percentage is a dimensionlessnumber.
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