Messed up the cone suggestion, hopefully this is better.

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Sale 1: Sold with a key for Purple Fetti Luchadore[45 keys via mini]

http://backpack.tf/profiles/76561198082458529?time=1431154800

http://backpack.tf/profiles/76561198082458529?time=1431241200

45*0.9=40.5 rounding to 41

41-1=40

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Sale 2: Sold with 3 keys in taunts for Burning Buckaroos[36 keys via mini]+Strange Professional Killstreak Australium Frontier Justice[17 via mini]

http://backpack.tf/profiles/76561198049761080?time=1430895600

http://backpack.tf/profiles/76561198049761080?time=1430982000

36+17=53

53*0.9=47.7 rounding to 48

48-3=45

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Sale 3: quicksold for amarathine rifleman

http://backpack.tf/profiles/76561198112866447?time=1430982000

http://backpack.tf/profiles/76561198112866447?time=1431068400

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Sale 4: Sold for Phosphorous Brigade Helm[42 via mini]+a key

http://backpack.tf/profiles/76561198101899047?time=1430118000

http://backpack.tf/profiles/76561198101899047?time=1430204400

42*0.9=37.8 rounding to 38

38+1=39

rounding up to 40 to make it look better.

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Mini on Buckaroos: Sold for 3 pure buds when buds were 12 keys each

http://backpack.tf/profiles/76561198110037051?time=1424073600

http://backpack.tf/profiles/76561198110037051?time=1424160000

3x12=36

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Mini on Justice: http://gyazo.com/34bb730191f52bb2a95f319d2ed8253e

rounding to 17 keys

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Mini on Luchadore: Sold for Vivid Plasma Tossle[45 keys]

http://backpack.tf/profiles/76561198083856665?time=1428994800

http://backpack.tf/profiles/76561198083856665?time=1429167600

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Mini on Tossle: Sold for 45 keys

http://backpack.tf/profiles/76561198102983158?time=1426402800

http://backpack.tf/profiles/76561198102983158?time=1426662000

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Mini on Brigade Helm: Sold for Stormy Yellow Belt[29 keys]+S.F.Sniper Rifle[13 keys]

http://backpack.tf/profiles/76561198101899047?time=1431068400

http://backpack.tf/profiles/76561198101899047?time=1431154800

42 keys

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If I did anything wrong, please let me know :D