Probably $5.
You'd really be wanting to know the agent commission, the fees the government charges you for mortgage discharge, bank break fees, conveyancer/solicitor fees and probably some other fees I can't think off offhand.
A lot, anyway.
I'm up for close to 10% in total fees and charges on the sale of mine, and that figure keeps growing every time I drop the listed price of the house as most of the costs are fixed.