For a $100 sale:
Final Value Fee: eBay takes approximately 12.9%, or $12.90.
Payment Processing Fees: Payment processors (like PayPal) charge around 2.9% + $0.30, which totals about $3.20.
Therefore, the total fees from a $100 sale are around $16.10, leaving you with $83.90 in profit before considering shipping or other costs.