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    Question

    A man purchases cold-drink for three consecutive years.

    In the first year, he purchases cold-drink at the rate of โ‚น 8.00 per litre, in the second year, at the rate of โ‚น 12.00 per litre and in the third year, at โ‚น 16.00 per litre. If he purchases cold-drink worth โ‚น 2,400 each year, the average price of cold-drink per litre for the three years is:
    A โ‚น 6.77 Correct Answer Incorrect Answer
    B โ‚น 12.93 Correct Answer Incorrect Answer
    C 11.07 Correct Answer Incorrect Answer
    D โ‚น 7.18 Correct Answer Incorrect Answer
    E โ‚น 10.90 Correct Answer Incorrect Answer

    Solution

    Price of cold-drink in first year = โ‚น 8.00 per litre.
    ∴ Quantity of cold-drink in first year = 2400/8.00 = 300 litres
    Price of cold-drink in second year = โ‚น 12.00 per litre.
    ∴ Quantity of cold-drink in second year = 2400/12.00 = 200 litres
    Price of cold-drink in third year = โ‚น 16.00 per litre.
    ∴ Quantity of cold-drink in third year = 2400/16.00 = 150 litres
    ∴ Required average = (3 × 2400)/ (300 + 200 + 150) = 7200/650 = โ‚น 11.07

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