21 is 5% of 420

21 is 5% of 420. Divide 21 by 420 and multiply by 100: 21 ÷ 420 = 0.05, and 0.05 × 100 = 5%.

21 is 5% of 420

How to work out what percent 21 is of 420

Percent = (X ÷ Y) × 100

  1. Write it as a fraction: 21/420 (simplifies to 1/20).
  2. Divide: 21 ÷ 420 = 0.05.
  3. Multiply by 100: 0.05 × 100 = 5%.

Check: 5% of 420 = 5 × 420 ÷ 100 = 21.

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