try to propose the following

来源: sweetptt 于 2013-10-26 14:59:05 [] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (163 bytes)
回答: 你是唯一的风险方。 由 sweetptt 于 2013-10-26 14:54:50

B's labor and material will be calculated as cost. The final profit is distributed proportionally. I bet B will not step in even B can potentially make more money.

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