When abbreviating the words number or numbers within the body of a text, use No. or Nos. but not the symbol #, which is generally reserved for tabular and statistical material:
Use the percent sign (%) in economic, financial, statistical or other documents where figures are abundant. In material of a general nature containing isolated references to percentages, the term is usually written out, except when used adjectivally:
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Outils d'aide à la rédaction – The Canadian Style
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