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प्रश्न
A car owner buys petrol at ₹ 7.50, ₹ 8 and ₹ 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol, if he spends ₹ 4000 each year?
विकल्प
₹ 7.98
₹ 8
₹ 8.50
₹ 9
MCQ
उत्तर
₹ 7.98
Explanation:
The total quantity of petrol
= `(4000/7.50+4000/8+4000/8.50)L`
= `4000(2/15+1/8+2/17)L = (76700/51)L`
Total amount spent = ₹ (3 x 4000) = ₹ 12000
∴ Average cost = ₹ `((12000xx51)/76700) = ₹ 6120/767`
= ₹ 7.98
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