Above you can see that if I wanted to buy Bitcoin at 488 USD I would have to sell at about 489.958 USD in order to break even, since I incur the fee when both buying and selling any currency on BTC-E. Currently the fee is hard-coded to 0.2%, but I will soon be utilizing the API to update the fee live.
The formula I use for the buy button (which shows what you would have to subsequently sell at) is:
The formula I use for the sell button is:
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