I had to do 6 sales. It was for a special occasion o3o

Sale 1 OUTLIER

http://www.tf2outpost.com/trade/23955880 Sold for Gfetti Noble + Spec KS SF Amby

B/O for Cone was 1.8

No trade for Noble and Amby, presuming offered

X = 1.8*0.9 + 0.5*0.9

X = 2.1

X = 1.8 (B/O)

Amby http://backpack.tf/item/1364186369

Noble http://backpack.tf/item/273264470

Cone http://backpack.tf/item/2375469980

Mini for Amby

Wouldn't really add much, only ~a key

Sale 2

http://www.tf2outpost.com/trade/24551730 Sold for a bud

X = 1

Bud http://backpack.tf/item/91796731

Cone http://backpack.tf/item/2348672625

Sale 3

http://www.tf2outpost.com/trade/23715246 Sold with 2-3 keys for Blizz Merryweather

Cone was offered on Merry

B/O for Merry was 1.7

B/O for Cone was 1.4

X + 0.1 = 1.4

X = 1.3

Merry http://backpack.tf/item/934684907

Cone http://backpack.tf/item/2575103673

Sale 4 OUTLIER

http://www.tf2outpost.com/trade/23737296 Sold for MN Cone + 8 keys

B/O for DBD was 2

B/O for MN was 15 keys or 1.1

X = 1.1*0.9 + 0.6

X = 1.6

MN http://backpack.tf/item/2233449006

DBD http://backpack.tf/item/2357976632

Keys http://backpack.tf/profiles/76561198080733119?time=1417183089#page0

Sale 5

http://www.tf2outpost.com/trade/23833919 Quicksold for a bud

X = 1

Cone http://www.tf2outpost.com/item/440,3214620679,435,5

Bud http://backpack.tf/item/97891677

Sale 6

http://www.tf2outpost.com/trade/24421613 Sold for a bud

X = 1

Bud http://backpack.tf/item/107566422

Cone http://backpack.tf/item/2209448572