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    Question

    Arjun used to save 40% of his

    income every month. After a 60% increase in his monthly income, his savings stayed constant. Determine the change in his monthly expenditure, whether it increased or decreased, and by how much.
    A 120% Correct Answer Incorrect Answer
    B 100% Correct Answer Incorrect Answer
    C 150% Correct Answer Incorrect Answer
    D 165% Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let monthly income of ‘Arjun’ is Rs. 100x Monthly savings of ‘Arjun’ = 0.40 × 100x = Rs. 40x Monthly expenditure of ‘Arjun’ = 100x – 40x = Rs. 60x Increased monthly income = 1.60 × 100x = Rs. 160x Monthly expenditure now = 160x – 40x = Rs. 120x Percentage % = [(120x – 60x)/60x] × 100 = 100%

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