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10 percent of what number is 40?

40 is 10% of 400

Reference: Percentage Calculator

Working out percentages

  1. We have, 10% × x = 40
  2. or, 10/100 × x = 40
  3. Multiplying both sides by 100 and dividing both sides by 10,
    we have x = 40 × 100/10
  4. x = 400

    If you are using a calculator, simply enter 40×100÷10, which will give you the answer.

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