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  9. Q50

TNPSC Group-I 2017 · Question 50 of 71

How many years will it take a certain amount to double at 8% interest per annum at simple interest?

Aptitude

  1. A13 1/3 years
  2. B12 1/2 yearsCorrect
  3. C10 1/2 years
  4. D9 years

Answer: B. 12 1/2 years

Explanation

Doubling needs 100% interest: 100/8 = 12.5 = 12 1/2 years.

Source: TNPSC Group-I Prelims 2017 (GS1902) - Official Question Paper (scribd OCR, tick-marked answers)

← Q49View full paper (71 questions)Q51 →

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