20percent

20percent is not a formal mathematical term; it is typically written as 20 percent or twenty percent. In informal or branded contexts, the string '20percent' may be used as a name or identifier. The concept it represents is the fraction one-fifth of a whole.

Mathematically, 20 percent equals 0.20 in decimal form and equals the fraction 1/5. To calculate 20 percent of a value x, multiply x by 0.2. To reduce a price by 20 percent, multiply by 0.8.

Applications include discounts, budgeting, taxation, and statistics. In retail, a 20 percent discount lowers the price to 80 percent of the original. In surveys, 20 percent might indicate a minority share of respondents.

Related concepts include the complement relationship (20 percent and 80 percent add to 100 percent) and the Pareto principle, which is often summarized as 80/20 — a reminder that a minority of causes can account for a majority of effects.

The term percent comes from per centum, meaning per hundred; the symbol % originated in medieval Europe and was popularized in the early modern period.

In formal writing, it is standard to write '20 percent' or 'twenty percent'; the joined form '20percent' is typically used only as a brand name, code, or URL.