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?
Answer: Option A
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Total quantity of petrol
consumed in 3 years = \(\left(\frac{4000}{7.50}+\frac{4000}{8}+\frac{4000}{8.50}\right)liters\)
\(=4000\left(\frac{2}{15}+\frac{1}{8}+\frac{2}{17}\right)liters\)
\(=\left(\frac{76700}{51}\right)liters\)
Total amount spent = Rs. (3 x 4000) = Rs. 12000.
Therefore Average Cost = Rs.\(\left(\frac{1700\times51}{76700}\right)=Rs.\frac{6120}{767}=Rs.7.98\)
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