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?
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Total quantity of petrol consumed in 3 years = [4000/7.50 + 4000/8 + 4000/8.45]
= 4000 [2/15 + 1/8 + 2/17]
= 76700/51 litres
= 4000 [2/15 + 1/8 + 2/17]
= 76700/51 litres
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
Average = 12000 x 51 / 76700 = Rs. 7.98Similar questions