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Sale 1

http://www.tf2outpost.com/trade/25970575 Sold for Steaming Tyrant's + 1.5 keys of sweets

B/O for Baker was 18 keys

Tyrant's had no trade, presuming offered

X = 13.5*0.9 + 1.5*0.9

X = 14

Sweets http://gyazo.com/ee739cb9a6ffbff4fd28c193440d5c8e

Baker https://backpack.tf/item/1640448116

Tyrant's https://backpack.tf/item/803128965

Sale 2

http://www.tf2outpost.com/trade/26113546 Sold for Duped Stormy Berliner's

B/O for Berliner's was 16 keys?

Baker had no trade, presuming offered

X = 16

Berliner https://backpack.tf/item/590053245

Baker https://backpack.tf/item/1409992403

Sale 3

http://www.tf2outpost.com/trade/25796852 Sold for Nuts Private

B/O of Private was 17 keys

B/O of Baker was 15

X = 15*0.9

X = 14

Private https://backpack.tf/item/3352639462

Baker https://backpack.tf/item/655582677

Mini for Private

http://www.tf2outpost.com/trade/25775646 B/O of 15 keys

http://gyazo.com/3d2fece46de53bbdc204114e6df4f3e7 B/Os of 15 keys

Using 15