4Game

Anyone who commonly crafts items and sells them on flea for a profit will most likely find this useful.
You can use ChatGPT with the following prompt to find the fee of a sale on flea
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Solve VO × Ti × 4PO × Q + VR × Tr × 4PR × Q

VO = [Price]

Ti = 0.035

PO is a modifier calculated as log10(VR / VO)

PR is a modifier calculated as log10(VR / VO)

Q = [Quantity]

VR = [Quantity × Price]

Tr = 0.06
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[Price] is the value of just 1 item
[Quantity] is the amount of items you are selling
[Quantity × Price] is simply [Quantity] multiplied by [Price]
Anything in square brackets you will have to fill in yourself for obvious reasons.

After doing that you will be left with the total price minus the fee.