Subject
Quantitative Aptitude
Topic
Average
A car owner buys petrol at Tk.50, Tk. 8 and Tk. 50 per litre for three successive years.. What approximately is the average cost per litre of petrol if he spends Tk. 4000 each year?
A car owner buys petrol at Tk.50, Tk. 8 and Tk. 50 per litre for three successive years.. What approximately is the average cost per litre of petrol if he spends Tk. 4000 each year?
ক)
Tk. 7.98খ)
Tk. 8গ)
Tk. 8.50ঘ)
Tk. 9Explanation
Total quantity of petrol consumed in 3 years = (4000/7.50 + 4000/8 + 4000/8.50) litres = 4000(2/15 + 1/8 + 2/17) litres = 76700/51 litres Total amount spent = Tk. (3 x 4000) = Tk. 12000. Average cost = Tk. (12000 x 51)/76700 = Tk. 6120/767 = Tk. 7.98Related questions
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