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      Question

      Rs. 8000 when invested at simple interest of r% p.a.

      amounts to Rs. 9600 in 24 months. If the same sum had been invested for 1 year at compound interest of (r + 20) % p.a. (compounded in every 4 months), then the amount received would be?
      A 10648 Correct Answer Incorrect Answer
      B 10248 Correct Answer Incorrect Answer
      C 10658 Correct Answer Incorrect Answer
      D 10048 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      According to the question, 9600 – 8000 = (8000 × r × 24) ÷ (12 × 100) Or, 1600 = 160 × r Or, r = 10 When the sum is invested at compound interest, Effective rate of interest = (r + 20) ÷ 3 = (10 + 20) ÷ 3 = 10% Effective time period = 1 × 3 = 3 units Amount received = Principal × {1 + (r/100)}time period = 8000 × {1 + (10/100)}3 = 8000 × (1.1)3 = 10648

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