According to the question, Quantity of diesel purchased by him in 1 year = (4500/6) = 750 litres Quantity of oil purchased in 2 year = (4500/9) = 500 litres Quantity of diesel purchased in 3 year = (4500/10) = 450 litres Total quantity of oil purchased in give three years = 750 + 500 + 450 = 1700 litres Total amount spent on diesel in given three years = 4500 × 3 = Rs. 13500 Required average = 13500/1700 = 7.9411 ~ Rs. 8
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