跪求:一个算法(88分)

我在做一个结账监控软件:<br>发货表 fhb 字段: 发货量, 价格,金额<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 10 &nbsp; &nbsp; &nbsp;2 &nbsp; 20<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 15 &nbsp; &nbsp; &nbsp;3 &nbsp; 45<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 20 &nbsp; &nbsp; &nbsp;4 &nbsp; 80<br>&nbsp; 回款表 hkb &nbsp; &nbsp;字段: &nbsp; 回货<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 30<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 40<br>&nbsp; 卖方要求买方,每发货量15量时要结一次账 卖方先3元定金<br>我想得到一个算法, 每发货量15 买方是否结过账 &nbsp;谢谢

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问题描述不清楚，表似乎字段不足，没有买房卖房信息内容呀

这跟表有关系吗？流程控制