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"vary 10 percent" vs "vary by 10 percent"

Both phrases are correct, but they are used in slightly different contexts. 'Vary by 10 percent' is the more common and idiomatic phrase, indicating the amount of variation. 'Vary 10 percent' is less common and may sound incomplete or unclear without the preposition 'by'.

Last Updated: March 31, 2024

vary 10 percent

This phrase is correct but less common and may sound incomplete or unclear without the preposition 'by'.

This phrase can be used to indicate a percentage of variation, but it may sound less idiomatic compared to 'vary by 10 percent'.

Alternatives:

  • vary by 10 percent
  • change by 10 percent
  • fluctuate by 10 percent
  • increase/decrease by 10 percent
  • shift by 10 percent

vary by 10 percent

This phrase is correct and commonly used to indicate the amount of variation.

This phrase is the more common and idiomatic way to express a percentage of variation. It clearly indicates the extent of the change.

Alternatives:

  • vary 10 percent
  • change by 10 percent
  • fluctuate by 10 percent
  • increase/decrease by 10 percent
  • shift by 10 percent

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