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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

Correct Answer: Rs. 7.98

Explanation:

Total quantity of petrol
consumed in 3 years

=	❨	4000	+	4000	+	4000	❩	litres
		7.50		8		8.50

= 4000	❨	2	+	1	+	2	❩	litres
		15		8		17

=	❨	76700	❩	litres
		51

Total amount spent = Rs. (3 x 4000) = Rs. 12000.

∴ Average cost = Rs.	❨	12000 x 51	❩	= Rs.	6120	= Rs. 7.98
		76700			767

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