Mua điểm
Giáo sư cho sinh viên của mình làm một bài kiểm tra. Khi kết thúc kiểm tra, các sinh viên nộp bài lại. Giáo sư thấy một sinh viên nộp bài thi kẹp tờ 100 đô la với một tờ giấy ghi: "Mười đô la một điểm".
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