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The wholesale prices of four types of backpacks are $$p_{1}$$, $$p_{2}$$, $$p_{3}$$, and $$p_{4}$$. A store orders these backpacks in the quantities of 65, 75, 50, and 60 backpacks, respectively. For which one of the four prices, if it were increased by 20 percent, would the total cost of the order increase by the greatest amount?
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以上解析由 考满分老师提供。
