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      Question

      A person purchased diesel at Rs. 8, Rs. 12 and Rs. 10

      per litre in three successive years. If he spent Rs. 4800 each year on diesel, then find the approximate average cost (per litre) paid by him in the given three successive years.
      A Rs. 12 Correct Answer Incorrect Answer
      B Rs. 15 Correct Answer Incorrect Answer
      C Rs. 9.73 Correct Answer Incorrect Answer
      D Rs. 7.20 Correct Answer Incorrect Answer
      E Rs. 11.83 Correct Answer Incorrect Answer

      Solution

      According to the question, Quantity of diesel purchased by him in 1 year = (4800/8) = 600 litres Quantity of oil purchased in 2 year = (4800/12) = 480 litres Quantity of diesel purchased in 3 year = (4800/10) = 480 litres Total quantity of oil purchased in give three years = 600 + 400 + 480 = 1480 litres Total amount spent on diesel in given three years = 4800 Ă— 3 = Rs. 14400 Required average = 14400/1480 = 9.729 ~ Rs. 9.73

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