I would not advice to trade forex through IB ... like I said: Tickmill is great ... IB is quite good for options and stocks, good price wise for futures but not marginwise ...
Have you even read this: https://www.interactivebrokers.com/en/index.php?f=commission&p=fx which someone else posted ? If so you should know the answer that it all depends on the size you are trading ...
And if I am not mistaken I think IB stopped providing forex-trading ... for what it's worth I am with Tickmill and so far really satisfied with them ...
it's simple adding and subtracting or didn't they learn you that at school ? your average price is 1.2252 the market prices is 1.2264, this means you are 12 pips in profit which is reflected also in unrealised p&l ...
With the kind of questions you are asking I would advise you not to trade with...
What I am doing is obviously not working too great ... so I decided to move back again to the 30M charts and adding eurjpy and gbpusd to my arsenal since signals will be far and in between ...
At this moment I am long eurjpy @ 135.69