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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?
Rs. 7.98
Rs. 8
Rs. 8.50
Rs. 9
The first year the car owner spends Rs.4000 and gets 4000/7.5 = 533.33 lires.
The second year he buys 4000/8 = 500 litres.
The third year, he buys 4000/8.5 = 470.59 litres.
So in the three he buys 533.33 + 500 + 470.59 = 1503.92 litres of petrol for Rs. 4000*3 = Rs.12000.
The average cost of petrol that he buys is 12000/1503.92 = Rs. 7.979
Hence, option 1 is the correct answer.
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