"You pay one final value fee for items you sell on eBay, and you don't have to worry about third party payment processing fees.
The final value fee is calculated as 12.8% of the total amount of the sale (which includes the item price, postage, taxes and any other applicable fees), plus a fixed charge of 30p per order. If the total amount of the sale is over £2,500 for a single item, you'll pay 3% for the portion of the sale price above £2,500."
Do you know how much the postage is?