# Percentage

Percent (%) is a ratio that represents parts per hundred. It is one way of expressing a fractional number.

Examples

The sales tax in some states is 5%. This amount is equal to 5 cents in sales tax for every 100 cents (or $0.05 per $1.00).

The air we breathe is about 21% oxygen, 78% nitrogen, and 1% argon and other gases. Refer to the image below.

Common fractions and decimal fractions are two other ways of expressing fractional numbers.

Examples

Common fraction | Decimal fraction | Percent |
---|---|---|

0.1 | 10% | |

0.5 | 50% | |

1.00 | 100% | |

1.25 | 125% |

See also fractional number, ratio.