Sale 2 is weird, but it shouldn't matter since it's in the middle of the range

Sale 1

http://www.tf2outpost.com/trade/26548726 Sold for KS Aussie Tomislav + Spec KS Rust Rocket Launcher + 2.5 key in sweets

Noir had not trade but clearly wasn't offered

B/O for Tomi was 25

X = 13.5*0.9 + 4*0.9 + 2.5*0.9

X = 18

Tomislav http://backpack.tf/item/3940006551

Stuff http://backpack.tf/profiles/76561198129035341?time=1437721200&compare=1437807600

Noir http://backpack.tf/item/2521289059

Sale 2

http://www.tf2outpost.com/trade/26300084 Sold for 15 keys + 3 in sweets + Some undisclosed amount I am unable to find, apparently "20%" cooler (2 keys) as per this trust comment https://gyazo.com/8b5ae1b37995163abe3f53cd64832c53

X = 15 + 3*0.9 + 2

X = 20

Stuff https://gyazo.com/2116db885d5050a22cfa54815962633f http://backpack.tf/profiles/76561198066065032?time=1435129200&compare=1435388400

Noir http://backpack.tf/item/2521289059

If Sale 2 is a problem i shall change it

Sale 3

http://www.tf2outpost.com/trade/26134089 Sold for 17 keys pure

B/O for Noir was 20

X = 17

Keys https://gyazo.com/b74cfb5002182c9b6bcb0423dd31540e http://backpack.tf/profiles/76561198011899925?time=1435215600&compare=1435561200

Noir http://backpack.tf/item/3005594674

Sale 4

http://www.tf2outpost.com/trade/26742557 Sold for 26 keys, but the B/O was 22 (Aussie knife sold on same day, possible reason)

B/O for Noir was 22

X = 22

Keys https://gyazo.com/0cdf6f3dcb17ec03959532329727815c http://backpack.tf/profiles/76561198044030424?time=1439794800&compare=1439881200

Noir http://backpack.tf/item/1839502653