Percentage change from 100 to 80

Instant answer with step-by-step formula

Percentage change from 100 to 80 = 20% decrease
((80 − 100) ÷ 100) × 100 = -20% (decrease)

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Step-by-step explanation

  1. Write the formula: ((New − Old) ÷ Old) × 100
  2. Subtract: 80 − 100 = -20
  3. Divide by old value: -20 ÷ 100 = -0.2
  4. Multiply by 100: -20% (decrease)

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