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WBCS Main Examination 2023 — Paper VI: Arithmetic and Test of Reasoning · Question 169 of 200

Q169
ArithmeticSimple & Compound Interest
In how many years a sum of ₹ 2,500 at 18% simple interest per annum will earn same interest at ₹ 1,500 earns at 10% p.a. in 12 years?
  1. a.3 years
  2. b.4 years
  3. c.5 years
  4. d.6 years

Answer: (B) 4 years

₹ 1,500 at 10% for 12 years earns 1500 × 10 × 12 ÷ 100 = ₹ 1,800. ₹ 2,500 at 18% earns ₹ 450 a year, so it needs 1800 ÷ 450 = 4 years. 3 years would give only ₹ 1,350.