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题小李以每千克0．8元的价格从批发市场购进若干千克西瓜,销售了部分西瓜之后,余下的每千克降价0．4元,全部售完, 销售金额与卖瓜的千克数之间的关系如图所示,那么小李赚了多少元?
Xiaoli purchased several kilograms of watermelon from the wholesale market at a price of 0.8 yuan per kilogram. After selling some of the watermelons, the remaining price of 0.4 kilograms per kilogram was sold out, and the sales amount and kilograms of melon sold were The relationship between the two is shown in the figure. How much Yuan does Li have earned?