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A girl spent 20% of her pocket money on books she was left with 7200 Naira how much is her pocket money

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  1. m = her pocket money

    A girl spent 20% of her pocket money on books means:

    She spent on books

    20% m = 20 / 100 m = 0.2 m

    Rest is:

    m - 0.2 m = 0.8 m

    She was left with 7200 means:

    0.8 m = 7200

    m = 7200 / 0.8 = 9000

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