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What percentage of numbers from 1 to 80 have 2 or 8 in the unit's digit?
- A20%
- B35%
- C40%
- D50%
Answer not set
Discussion 1
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CCommunity
We know that, The numbers which have 2 or 8 in the unit’s digit are 2, 12, 22, 32, 42, 52, 62, 72 and 8, 18, 28, 38, 48, 58, 68, 78
⇒ Total numbers with 2 or 8 in the unit’s digit = 16
⇒ Total numbers = 80
⇒ Percentage = (Numbers with 2 or 8 in the unit’s digit/Total numbers) × 100
∴ Percentage = (16/80) × 100 = 20%
⇒ Total numbers with 2 or 8 in the unit’s digit = 16
⇒ Total numbers = 80
⇒ Percentage = (Numbers with 2 or 8 in the unit’s digit/Total numbers) × 100
∴ Percentage = (16/80) × 100 = 20%