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      Question

      A certain amount becomes four times in 25 years under

      simple interest at a r% per annum. If Rs.8,000 is invested at (r − 4)% simple interest per annum, then find the interest earned after 10 years.
      A Rs. 6,400 Correct Answer Incorrect Answer
      B Rs. 5,600 Correct Answer Incorrect Answer
      C Rs. 8,000 Correct Answer Incorrect Answer
      D Rs. 7,200 Correct Answer Incorrect Answer

      Solution

      Let the principal be Rs. 'P' Then, Simple Interest = 4P - P = Rs. 3P 3P = (P × r × 25) / 100 3 = (r × 25) / 100 r = 12 Now, new rate = (r − 4)% = 8% Simple Interest = {(8000 × 8 × 10) / 100} = Rs. 6,400

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