This is a stick from the Branch of Trains

Sale 1

http://www.tf2outpost.com/trade/26857085 Sold with 7 keys for Stormy YWN

B/O for Stormy was 34

Mem Leak had no trade, presuming offered

X = 23*0.9 + 7

X = 28

Stormy http://backpack.tf/item/977690836

Mem Leak http://backpack.tf/item/1669894449

Keys https://gyazo.com/577072b07b4008441acda2e5315812dd http://backpack.tf/profiles/76561198065614714?time=1440918000&compare=1441004400

Mini for Mem Leak

http://backpack.tf/vote/id/560d1045dea9e96c3119627a 23 keys, using 23

Sale 2

http://www.tf2outpost.com/trade/27031257 Sold for Smoking Panama + 15 keys + 2.2 keys of sweets

B/O for YWN was 29

B/O for Panama was 15

X = 14*0.9 + 2.2*0.9 + 15

X = 30

X = 29 (B/O)

Panama http://backpack.tf/item/1818598136

YWN http://backpack.tf/item/2525194940

Keys https://gyazo.com/e8ee3c817183edf90d3da47900d51c5c http://backpack.tf/profiles/76561198054540958?time=1442559600&compare=1442646000

Sale 3

http://www.tf2outpost.com/trade/26815537 Sold for Aussie Sniper Rifle

YWN had no trade, presuming offered

X = 32

X = 30 (Refer to below)

Rifle http://backpack.tf/item/4018529128

YWN http://backpack.tf/item/977690836

Sellers

http://www.tf2outpost.com/trade/27055873 B/O of 30

http://www.tf2outpost.com/trade/27009229 B/O of 32

Capping sale 3 at 30 keys due to the two sellers above

If i can't do this, i'll revise this suggestion