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? -

Question: 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

Answer: Option A

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