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      Question

      Rajan invested Rs. 18,000 in a scheme offering x% p.a.

      simple interest for x years. Interest earned by him after โ€˜xโ€™ years is Rs. 11520. Find the interest earned by him if he invested Rs. 12,000 at x% p.a. simple interest for 4 years.ย 
      A Rs.3,800 Correct Answer Incorrect Answer
      B Rs.3,840 Correct Answer Incorrect Answer
      C Rs.4,440 Correct Answer Incorrect Answer
      D Rs.2,220 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Interest earned by Rajan = 18000 ร— x ร— x/100 = 11520 180x2 = 11520 x2 = 64 x = 8 So the value of x = 8 Interest earned on Rs. 12,000 = 12000 ร— 0.08 ร— 4 = Rs.3,840

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