TURNOVER FOR 44AD - F N O BUSINESS

If you opt for presumptive scheme under sec.44AD then you have to show 90lakh as your turnover in trading business & 8 lakh as profit or 6% of turnover which ever is higher.
you can not claim expenses whatever income you will show will be deemed to be yours net income.
if your gain is less then 6% computed as per provision then you are required to get your accounts audited under sec 44AB & maintain books of account.

If I Maintain Proper books of accounts, how will you make the p/L ... say Positive side figures are 50 lakhs, negative figures are 40 lakhs... Net profit 10 lakhs.

Positive & Negative figures will be aggregated while calculating turnover in derivative segment.
Even if you received premium on option writing that too included in turnover

Sir. How will I make the p/l in case of tax audit... turnover is only for establishing if tax audit is applicable or not. but actually no such figure of 90L will become my turnover if I make P/L

You have to prepare trading a/c where you will show your turnover & direct expenses relating to your trading business.
and yes turnover is to identify whether tax audit is applicable or not but in some cases 44AD result into some tax liability which is ideally not beneficial for Assessee even if he eroded all his fund in F & O then they go for audit

Sir so if I make my P/L would be like under.

sales turnover-50 lakha
purchase turnover 40 lakhs
gross profit 10 lakha
expense 1 lakh
net profit 9 lakhs

so turnover for 44AD would be 50 lakhs or 90 lakhs? I think it should be 50 lakhs.