percentage

Digit followed by % sign, no space:

Of the 5000 people who answered the survey, 10% were French.

58%, 90% etc

When calculating percentages, beware the "rose by/fell by X%" construction: an increase from 3% to 5% is a 2-percentage-point increase or a 2-point increase, not a 2% increase

Never use the "per thousand" symbol, ‰

0.001 not 1‰

For smaller decimals, house style decrees scientific notation:

1 × 10-6 not 0.000 001

Except when comparing percentages directly:

The company's market share fell from 0.01% to 0.000 43% (not 4.3 × 10-4% in this case - keeping the decimal format accentuates the comparison)

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