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?
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Explanation:
Total quantity of petrol consumed in 3 years =(4000/7.50+4000/8+4000/8.50) liters
= 4000(2/15+1/8+2/17) liters
= 76700/51 liters
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
Average cost = Rs. (12000*51/76700) = Rs. 7.98.
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