CA Job
                
                   512 Points
                   Joined March 2007
                
               
			  
			  
             
            
             Dear Gopalan Sir
First of all, I have made a big mistake while expalining the treatment of intarday sales in Point 4 in the last part of my answer wherein I WRONGLY stated that-
"the turnover is "net" of all positive and negative incomes from various transactions."
Actually the term should be "aggregate" instead of "net" and it is my mistake. However, Shri. CA. Ajit Mundada Sir has prompty clarified my mistake in a subsequent post. In order to clarify the same on my part I am editing my old answer to make it right and I can only wish that nobody acted upon it. My sincere appologies for the wrong opinion.
Now, to come to your query, in case of speculative transaction, you need consider the transaction value for the purpose of detmermining your "turnover". Instead you have to take the AGGREGATE all the positive and negative differences from each of your 30 odd transactions and if this aggregate exceeds Rs.1 Crore, then only you need to have your books audited u/s 44AB.
For Eg., suppose from first sale, you made a PROFIT of Rs.50,10,000 and in the second transaction you made a LOSS of Rs.50,00,000. In this case, though your "net" result is a profit of Rs.10,000, for the purpose of determining "turnover" u/s Sec.44AB, you have to "aggregate the postive and negative diffreneces", that is ignore the negative sign, and thus, your turnover will be Rs.1,00,10,000 which is above Rs.1 Crore and thus, the situtaion mandates a tax audit u/s 44AB. 
Regards
Ajay