383． when hardpaper sale 100,000, some softpaper are produced. when the total number of sale is 200,000, the price of softpaper is 1/3 of the hardpaper.,the ratio of the number of hardpaper to the number of softpaper is 3:1. the question is :what is the fraction of the revenue of sale of softpaper to the total revenue when the total number of sale is 300,000.
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