题目内容
制造某种产品需要4道工序，每道工序可选用多种方法。下图列出了制造这种产品各道工序可选用的不同方法：从节点1开始，连续经过4条线段（表示4道工序所选用的方法），组成一条线路，直到节点12结束。每条线段上标记的数字表示利用相应方法每件产品可以获得的利润（元）。企业为了获取最大利润，需要找出从节点1到节点12的一条线路，使其对应的各道工序的利润之和达到最大。利用运筹方法计算后可知，制造每件产品可以获得的最大利润是（）元。
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