They tried to scare all Year 11s in my school into thinking the HSC was like the strictest thing alive.

Sale 1

http://www.tf2outpost.com/trade/24676713 Sold for 1 bud 1 key

X = 1 + 0.1

X = 1.1

Cap http://backpack.tf/item/2198766521

Bud http://backpack.tf/item/282226103

Sale 2

[No OP Trade] Sold for 12 keys pure

X = 1.1

Keys http://backpack.tf/profiles/76561198048480952?time=1419840000#page3

Cap http://www.tf2outpost.com/item/440,3362786274,95,5

Sold on 27th Dec as according to a history of one of the keys http://backpack.tf/item/2198766521

Backpack.tf did not catch the Engi Cap in JJ Mong's backpack, therefore his name does not appear

Sale 3

http://www.tf2outpost.com/trade/24510463 Sold for Peace Beanie

B/O for Beanie was 16 keys

Cap had no trade, presuming offered

X = 13.5 keys (0.9)

Beanie http://backpack.tf/item/294743015

Cap http://backpack.tf/item/2830910776

Mini for Beanie

http://www.tf2outpost.com/trade/24804134 Sold for Stormy Scotsman's

B/O for Beanie was 14 keys

X = 17*0.9

X = 15 keys

X = 14 keys (B/O)

Scots http://backpack.tf/item/1062477668

Beanie http://backpack.tf/item/294743015

Also sold for 13 keys pure http://www.tf2outpost.com/trade/24842208

X = 13 keys

Keys http://backpack.tf/profiles/76561198025605595?time=1422432000#page1 (2 of those keys are invalid)

Beanie http://backpack.tf/item/294743015

Using 13.5 keys

Sale 4

http://www.tf2outpost.com/trade/24539266 Sold for 13 keys pure (But had an offer of 14...?)

If X = 13 keys

X = 0.9

If X = 14 keys

X = 1

Keys http://backpack.tf/profiles/76561197970139990?time=1420876800#page6

Cap http://backpack.tf/item/2830910776