Re-suggesting again, I asked polar to confirm.

http://gyazo.com/58f42b98837b8b9d9dee2e32c60f5b0e

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Sale 1: Sold for a Cloudy Swagmans(9.75)+Duped Max Head(3.6)

Trade: http://www.tf2outpost.com/trade/24827745

Seller's bp before:

http://backpack.tf/profiles/76561198058726700?time=1423900800

Seller's bp after:

http://backpack.tf/profiles/76561198058726700?time=1423987200

9.75*0.9=8.775 rounding up to 8.8

8.8+3.6=12.4 buds

12.4 buds converting to keys is 99 keys

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Sale 2: Sold for a Death at Dusk Tyrants(14 buds)

Trade: http://www.tf2outpost.com/trade/25388019

Seller's bp before:

http://backpack.tf/profiles/76561198077936644?time=1426489200

Seller's bp after:

http://backpack.tf/profiles/76561198077936644?time=1426575600

http://gyazo.com/c3cbc066d679a7fc196f9306205e8eef -got this from my friend since he just sold it.

14*0.9=12.6 buds

12.6 buds converting to keys is 101 keys

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If I did anything wrong please let me know :D