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12 is what percent of 40?

12 of 40 is 30%

Reference: Percentage Calculator

Working out percentages

  1. 12 of 40 can be wriiten as:
    12/40
  2. Multiply both numerator & denominator by 100

    12/40 × 100/100 = 30/100 = 30%

    If you are using a calculator, simply enter 12÷40×100 which will give you 30 as the answer.

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