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1차 거래에서

1. 신사에게 받은 수표를 현금으로 교환함으로  [ +100 ]
2. 신사에게 거스름돈                         [ -20  ]
3. 반지 원가                                 [ -60  ]
4. 수표 배상                                 [ -100 ]

합이                                         [ -80  ]

이 문제 함정이 반지의 차익임, 반지의 차익은 생각하지 않아야함.

100 만원을 받아서 20의 거스름돈과 60의 원가를 제하면 나오는게 차익임 여기서 +20을 했다면 속은거임


2차 거래

1.수표 교환                  [ +200 ]
2.신사의 친구에게 거스름돈   [ -50  ]
3.신사에게 돌려줄 차액       [ -50  ]
4.가짜수표 배상              [ -200 ]

합                           [ -100 ]

신사의 친구가 신사에게 빚진돈은 150만원 이기때문에 신사의 친구에게 50만원을 주고

산사가 보석상에게준 수표와 남은 150만원의 차액인 50만원을 신사에게 지급

그리고 마지막으로 다시 수표배상 200만원 1차, 2차 거래의 손해를 합치면 -180만원

ㅋㅋㅋ 보석상아저씨 혈압올라 운명하시겠네ㅋㅋㅋ

ㅋㅋㅋ 반지 하나 팔아보려다가 -180만원 ㅋㅋㅋ 보석상 아저씨 스트레스로 혈압급상승 ㅋㅋㅋㅋ

신사 + 신사 친구는 위조수표로 포돌이 출동 ㅋㅋㅋㅋ 막장이네