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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?
- A. Rs. 7.98
- B. Rs. 8
- C. Rs. 8.50
- 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
$$eqalign{
& = left( {frac{{4000}}{{7.50}} + frac{{4000}}{8} + frac{{4000}}{{8.50}}} right){text{litres}} cr
& = 4000left( {frac{2}{{15}} + frac{1}{8} + frac{2}{{17}}} right){text{litres}} cr
& = {frac{{76700}}{{51}}} {text{ litres}} cr
& {text{Total}},{text{amount}},{text{spent}} cr
& = Rs.,left( {3 times 4000} right) cr
& = Rs.,12000 cr
& therefore {text{Average}},{text{Cost}} cr
& = Rs., {frac{{12000 times 51}}{{76700}}} cr
& = Rs.,frac{{6120}}{{767}} cr
& = Rs.,7.98 cr} $$
