một xí nghiệp dự định sản xuất 1500 sản phẩm trong 30 ngày . nhưng nhờ tổ chức hợp lí nên thực tế đã sản xuất mỗi ngày vượt 15 sản phẩm . do đó xí nghiệp sản xuất không những vượt mức dự định 225 sản phẩm mà còn hoàn thành trước thời hạn . hỏi thực tế xí nghiệp đã rút ngắn bao nhiêu ngày

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