Homework, i shall do it now

Sale 1

[No OP Trade] Sold for 16 keys

X = 16

Keys https://gyazo.com/ddba86f68509e78d4ac8e772f4518c83 https://backpack.tf/profiles/76561198192602363?time=1442127600&compare=1442041200

Bucket https://backpack.tf/item/2492927305

Sale 2

http://www.tf2outpost.com/trade/26954719 Sold for Twatt Raincatcher + Pink Beep Man

B/O for Bucket was 17

Raincatcher had no trade, presuming offered

X = 18*0.9 + 2*0.9

X = 18

X = 17 (B/O)

Raincatcher https://backpack.tf/item/2206721345

Bucket https://backpack.tf/item/2492927305

Mini for Raincatcher

https://backpack.tf/vote/id/5652c307ba8d88ed55a94b2f 18 keys, using 18

Sale 3

http://www.tf2outpost.com/trade/27217812 Sold for Nuts Larrikin + 9 keys

B/O for Bucket was 17

B/O for Larrikin was 13

X = 10*0.9 + 9

X = 18

X = 17 (B/O)

Larrikin https://backpack.tf/item/1798372460

Bucket https://backpack.tf/item/3216968747

Keys https://gyazo.com/6395be88a216159f0cdd05b39ffc091e https://backpack.tf/profiles/76561198092877201?time=1445410800&compare=1445756400

Mini for Larrikin

No available sales. http://www.tf2outpost.com/trade/27448702 B/O of 10, using 10