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Question
A car owner buys petrol at Tk. 17, Tk. 19 and Tk. 20 per litre for three consecutive years. Computer the average cost per litre, if he spends Tk. 6460 per year.
Tk. 18.49
Tk. 18.58
Tk. 19.20
Tk. 21.66
ANSWER : 2
Descrption
<ol><li>Calculate the total amount spent on petrol over three years, which is Tk. 6460 per year multiplied by 3:</li></ol><p style="margin-left:0px;">Total spent = Tk. 6460/year * 3 years = Tk. 19380</p><ol><li>Calculate the total amount of petrol purchased over three years. To do this, divide the total amount spent by the cost per liter for each year:</li></ol><p style="margin-left:0px;">For the first year: Tk. 19380 / Tk. 17/liter = approximately 1140 liters For the second year: Tk. 19380 / Tk. 19/liter = approximately 1020 liters For the third year: Tk. 19380 / Tk. 20/liter = approximately 969 liters</p><ol><li>Add up the total liters of petrol purchased over three years:</li></ol><p style="margin-left:0px;">Total liters = 1140 liters + 1020 liters + 969 liters = 3129 liters</p><ol><li>Calculate the average cost per liter by dividing the total amount spent by the total liters purchased:</li></ol><p style="margin-left:0px;">Average cost per liter = Tk. 19380 / 3129 liters ≈ Tk. 18.58/liter</p><p style="margin-left:0px;">So, the average cost per liter is approximately Tk. 18.58.</p>
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