A car owner or a man buys petrol at ₹ 8, ₹ 9 and ₹ 11 per litres for three successive years. What approximately is the average cost per litres of petrol if he spends ₹ 4000 each year? [Numerical may differ]
- A. ₹ 9.17 ✓
- B. ₹ 11.2
- C. ₹ 7.12
- D. ₹ 12.6
Correct Answer: A. ₹ 9.17
Explanation
Total money spent = 3 \times 4000 = 12000. Total petrol bought = \frac{4000}{8} + \frac{4000}{9} + \frac{4000}{11} = 500 + 444.44 + 363.63 = 1308.08 litres. Average cost = \frac{12000}{1308.08} \approx 9.17.
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