A car owner buys petrol at Rs 7 50 Rs 8…

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A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?

  1. A. Rs. 7.98
  2. B. Rs. 8
  3. C. Rs. 8.50
  4. D. Rs. 9

E. None of these

Here is complete explanation of A car owner buys petrol at Rs 7 50 Rs 8….

Solution(By ExamCraze Team)

Total quantity of petrol consumed in 3 years
$$eqalign{ & = left( {frac{{4000}}{{7.50}} + frac{{4000}}{8} + frac{{4000}}{{8.50}}} right){text{litres}} cr & = 4000left( {frac{2}{{15}} + frac{1}{8} + frac{2}{{17}}} right){text{litres}} cr & = {frac{{76700}}{{51}}} {text{ litres}} cr & {text{Total}},{text{amount}},{text{spent}} cr & = Rs.,left( {3 times 4000} right) cr & = Rs.,12000 cr & therefore {text{Average}},{text{Cost}} cr & = Rs., {frac{{12000 times 51}}{{76700}}} cr & = Rs.,frac{{6120}}{{767}} cr & = Rs.,7.98 cr} $$

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