300 worldwide would be a small number for WB. 200  is a bomb. of course they will make their money back. but this is an  epic bomb.
		
		
	 
Yes, it's current worldwide gross of $205 million is still considered a big loss... yes, a BIG loss.
* To Break Even on Production Budget * 
Green Lantern needed a worldwide gross of approximately 
$364 MILLION to just break even.  
To get that number all you do is take estimated production budget at  $200 million and divide it by 55% (the studio share of the gross  revenue) which equals approximately $364 million.  The typical studio/theater share is 55-45.
Again, this is just to break even from it's Production Budget of an   estimated $200 million.  This does not even include the Marketing  Budget. 
It's current $205 million worldwide gross only gives Warner Bros only a  net of $113 million; do the math $207M budget - $113M net = $87M aka  meaning those WB Executive Producers are still at a loss of $87 million.
	
		
	
	
		
		
			It will be lucky to break even.
		
		
	 
It won't even come close to breaking even.  Not even close.  About $159 million short of breaking even.
Green Lantern needed Thor's worldwide numbers (currently at $448 million) to make a profit.  
Even if Green Lantern did Captain America numbers (currently at $325 million), it likely won't still be close to breaking even after it's run since it needed at least $364 million due to it's bigger budget.  
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Think of it this way.
You (Warner Bros) want to sell an item (Green Lantern Movie) on Ebay (the Movie Theaters).  
The item cost you $200.
People then started placing bids (audience going to the cinemas) and you end up selling the item for $205 after the auction (the initial theater run).  
So that's a profit right?  
Nope.  
Because for this listing, Ebay (the Movie Theaters) charged you a 45% fee for hosting your item (Green Lantern Movie) on their site.  Meaning you only get 55% of the revenue.
So rather than net a $205 for a $5 profit, you actually only got $113 from the sale with a loss of $87.