thx a lot!!!~~

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Lv 5
1 十年前
最愛解答

In mathematics, a percentage is a way of expressing a number as a fraction of 100 (per cent meaning &quot;per hundred&quot;). It is often denoted using the percent sign, &quot;%&quot;. For example, 45 % (read as &quot;forty-five percent&quot;) is equal to 45 / 100, or 0.45.

Percentages are used to express how large 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 0.15 / 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..

資料來源： Wikipedia