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我需要做一个总和来生成促销优惠券，每个客户获得 200 美元一（1）张优惠券，假设他注册 1000 美元......他将有权获得五（5）张优惠券等等，怎么能我得到客户群花费的金额并根据价值生成优惠券diso？
谢谢！