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      Question

      A sum when invested at simple interest of 12.5% p.a.

      amounts to Rs. 10,000 after 2 years. If the same sum was invested at simple interest of 9% p.a. for 4 years, then what would be the interest earned?
      A Rs. 2,560 Correct Answer Incorrect Answer
      B Rs. 3,200 Correct Answer Incorrect Answer
      C Rs. 2,880 Correct Answer Incorrect Answer
      D Rs. 3,000 Correct Answer Incorrect Answer
      E Rs. 2,700 Correct Answer Incorrect Answer

      Solution

      Let the sum invested be Rs. 'P' Simple interest = (Sum X Rate of interest X time period in years) ÷ 100 ATQ: 10000 - P = (P X 12.5 X 2) ÷ 100 Or, 10000 - P = 0.25P So, 10000 = 1.25P So, P = (10000/1.25) = 8,000 So, required interest = (8000 X 9 X 4) ÷ 100 = Rs. 2,880

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