How the profit is calculate please explain

Hi i am just getting a start in forex trading my broker have given me account with 1:100 leverage
can any one please explain me the new order process

1>it shows me volume 0.01 what does that means. if i increase this value then what i am doing

  1. i have open a sell position on eurusd pair with volume 0.01 in new order dialouge
    it goes down 0.3 pips profit is showing 0.03 how that is calculated
    swap for eurusd showing in market watch is 20

can any one please explain how that profit is calculated…??

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