In nontechnical writing, percentages are usually expressed as numerals followed by the word percent. In technical writing, the % symbol is used instead of percent, with no space between the numeral and symbol. Please note that if a sentence begins with a percentage, normal number rules apply and the percentage is spelled out (see the first example below). Also, a hyphen is not used when the percentage is acting as a modifier (see the second example below). A nontechnical context is assumed for each of the following examples.
- Seventy-five percent of men agreed with the statement.
- The factory was operating at 50 percent capacity.
- He has completed 33 percent of the project.
- She garnered 55.4 percent of the popular vote.
- I answered 100 percent of the questions correctly.