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6. A sporting goods store sells two kinds of Dung sticks for a popular game in Bangladesh Dunguli. These are similar but made by different manufacturers. The cost to the store of the first kind is EDT 40, and the cost to the store of the second kind is BDT 50.00. Experience has shown that if the selling price of the first kind is x dollars and the selling price of the second kind is 1: dollars, then the number sold monthly of the first kind is 3.200 50): + 25y, And the number sold monthly of the second kind is 25 - am. What should be the selling price of each kind of Dung stick for the greatest gross profit? Find the maximum profit