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percent, %, and percentage

Use the symbol % with numerals; use the word "percent" when you spell out numbers at the beginning of a sentence. To determine whether "percent" or % is singular or plural, look at the noun following it. If the next noun is a plural, use a plural verb; if it's singular, use a singular verb.

The maximum glucose yield was 60%.
Six percent of the pipes were rusty.
More than 10% of that amount was allocated to planning.

When there is no number, use the word "percentage," unless people in your field use a different terminology, such as "percent difference."

This table shows the percentages of government buildings having solar roofs, by state.