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    Question

    The average cost of items bought by a shopkeeper is

    ₹150. He purchases another item for ₹270, and the average increases by ₹10. Find the total cost of the items before the last purchase.
    A 1650 Correct Answer Incorrect Answer
    B 1600 Correct Answer Incorrect Answer
    C 1700 Correct Answer Incorrect Answer
    D 1500 Correct Answer Incorrect Answer

    Solution

    Let the number of items before this one be 'P'.

    Cost before = 150P

    (150P + 270) / (P + 1) = 160
    => 150P + 270 = 160P + 160
    => 10P = 110 => P = 11

    Total cost = 150 × 11 = ₹1,650

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