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2 năm trước
Một công nhân được giao làm 120 sản phẩm trong thời gian quy định. Sau khi làm được 2 giờ, người đó cải tiến kĩ thuật nên mỗi giờ người đó đã làm được thêm 4 sản phẩm so với dự kiến. Vì vậy trong thời gian quy định không những hoàn thành kế hoạch mà còn vượt mức 16 sản phẩm. Tính năng xuất làm lúc đầu.
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