I.

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Sold for [Blizzardy Storm Honcho's Headgear (1.55) + 2 keys in sweets]:

History of buyer before:

http://backpack.tf/profiles/76561198096591232?time=1418457600

History of buyer after:

http://backpack.tf/profiles/76561198096591232?time=1418802788

(1.55 + .16) * .9 = 1.539 buds

Rounded to 1.5 buds

Sold for Disco Beat Down Larrikin Robin (2.2):

Backpack of seller before:

http://backpack.tf/profiles/76561198082771137?time=1415124666

Backpack of seller after:

http://backpack.tf/profiles/76561198082771137?time=1415520000

2.2 * .9 = 1.98 buds

Rounded to 2 buds

Sold for [Steaming Well-Rounded Rifleman (1.61) + 2 keys]:

Post:

http://www.tf2outpost.com/trade/23947423

Backpack of buyer before:

http://backpack.tf/profiles/76561198091819789?time=1418025600

Backpack of buyer after:

http://backpack.tf/profiles/76561198091819789?time=1417852800

1.61 * .9 + .15 = 1.599 buds

Rounded to 1.6 buds

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Feel free to leave your thoughts.