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    While selling 15 balls for Rs. 1,220, there is loss equal to the cost price of 5 balls. The cost price (in Rs. ) of one ball is:
    Question

    While selling 15 balls for Rs. 1,220, there is loss equal to the cost price of 5 balls. The cost price (in Rs. ) of one ball is:

    A.

    145

    B.

    122

    C.

    112

    D.

    120

    Correct option is B

    Given:

    Selling price of 15 chairs = Rs. 1220.
    Loss = Cost price of 5 chairs
    Formula Used:
    Loss = CP - SP
    Solution:
    Let C be the Cost price of one chairs
    As we know,
    Selling Price of 15 chairs = Cost Price of 15 chairs − Loss
    1220 =15 − 5C
    1220 = 10 C
    = 122
    Thus, the cost price of one ball is Rs.122

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