Spell out percent in running text and, if space allows, in charts, graphs, etc. It is acceptable to use the percent sign (%) in scientific and statistical copy, if necessary.

Percentages should always be in numerals, including when listing percentages under 10. The noun in the phrase determines whether the verb is singular or plural. Eighteen percent of the team is playing this season.

Do not hyphenate when using percent as an adjectival phrase: a 20 percent increase.

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