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    Question

    The cost of a mobile phone was

    first increased by 25% and then decreased by 25%. If the new cost of the mobile phone is Rs. 675, find the original cost of the mobile phone.
    A Rs.700 Correct Answer Incorrect Answer
    B Rs.720 Correct Answer Incorrect Answer
    C Rs.620 Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the original price of the mobile phone be Rs. ‘100x’ So, new price of the mobile phone = 100x × 1.25 × 0.75 = Rs. ‘93.75x’ So, 93.75x = 675 So, x = 7.2 So, original price of the mobile phone = 100 × 7.2 = Rs. 720 Alternate solution: Original cost of the mobile phone = 675 ÷ 0.75 ÷ 1.25 = Rs.720

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