The objective of forex currency trading is to exchange one currency
for another in the expectation that the market rate or price will
change so that the currency you bought has increased its value
relative to the one you sold. If you have bought a currency and the
price appreciates in value, then you must sell the currency back in
order to lock in the profit. 
  
For More detail please visit 
http://www.bigjumping.com/forex-information/Forex_trading_calculating_profit_information.htm
  
And find them to Get free $5 (live) and $10000 (virtual)
  
Good luck
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