Percentage change from 100 to 90

Instant answer with step-by-step formula

Percentage change from 100 to 90 = 10% decrease
((90 − 100) ÷ 100) × 100 = -10% (decrease)

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Step-by-step explanation

  1. Write the formula: ((New − Old) ÷ Old) × 100
  2. Subtract: 90 − 100 = -10
  3. Divide by old value: -10 ÷ 100 = -0.1
  4. Multiply by 100: -10% (decrease)

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