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WBCS Main Examination 2023 — Paper VI: Arithmetic and Test of Reasoning · Question 131 of 200

Q131
ArithmeticSimple & Compound Interest
At what rate percent per annum will a sum of money double in 16 years?
  1. a.$6\frac{1}{4}$%
  2. b.$6\frac{1}{2}$%
  3. c.6%
  4. d.$5\frac{1}{4}$%

Answer: (A) $6\frac{1}{4}$%

At simple interest, doubling means interest equal to 100% of the sum. Over 16 years that is 100 ÷ 16 = 6·25% a year, i.e. $6\frac{1}{4}$%. 6% would take about $16\frac{2}{3}$ years.

Q130 Whole paperQ132