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) 6.23
B) 7.98
C) 8.97
D) 9.89
Answer: B) 7.98
Explanation:
Total quantity of petrol consumed in 3 years =
= 
= 
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
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