Fellow CA
                
                   86871 Points
                   Joined June 2009
                
               
			  
			  
             
            
             if you are taking delivery, then the sell and buy value is the actual values of sell and buy side.
 
however, if the delivery is not being taken, then the turnover is calculated as sum of absolute values of sell - buy.
 
In your case, 40000 is the turnover. 10K is the interest expense.