cost of 10 copies of a book equal to the selling price of 8 copy what is the presence of a grand of floors in crushed

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cost of 10 copies of a book equal to the selling price of 8 copy what is the presence of a grand of floors in crushed ​

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cost of 10 copies of a book equal to the selling price of 8 copy what is the presence of a grand of floors in crushed ​