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https://marketplace.tf/items/tf2/1113;5;u3029
Item has sold for 20 dollars then 11 then 17. The average price of these 3 is 16 and that a key on marketplace is worth 1.8$ which is 8.88888888889 keys rounded up to 9 keys.
dont take the average of all sales, treat the sales as individual sales
Thanks for the advice I will update this post