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      Question

      The interest received on investing Rs. 12,500 for 4

      years at simple interest of 'k%' p.a. is Rs. 10,000. Find the total amount received on investing Rs. 8,000 for 2 years at compound interest of 'k%' p.a., compounded annually.
      A Rs. 9,600 Correct Answer Incorrect Answer
      B Rs. 10,800 Correct Answer Incorrect Answer
      C Rs. 11,520 Correct Answer Incorrect Answer
      D Rs. 10,240 Correct Answer Incorrect Answer
      E Rs. 12,000 Correct Answer Incorrect Answer

      Solution

      According to the question, 12500 × (4 × k ÷ 100) = 10000 Or, 500k = 10000 So, k = 10000 ÷ 500 = 20 So, total amount received on investing Rs. 8000 = 8000 × {1 + (20/100)}2 = 8000 × 1.22 = 8000 × 1.44 = Rs. 11,520

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