CDS 2026 (I) Elementary Mathematics, question 12

Topic: Arithmetic (percentage, ratio, interest, time and work, speed)

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Q12

In what duration of time will ₹33003300 become ₹33993399 at 12%12\% per annum interest compounded quarterly ?

  1. (a) 3 monthsCorrect answer
  2. (b) 6 months
  3. (c) 9 months
  4. (d) 1 year

Solution.

Answer: (a) 3 months

  1. The quarterly interest rate is 12%/4=3%12\%/4 = 3\%.
  2. One quarter changes ₹3300 to Rs. 3300×1.03=Rs. 3399Rs.\, 3300 \times 1.03 = Rs.\, 3399, exactly the required amount.