Calculation of profit/loss in shares & f&o

For delivery trading in equity segment

How to calculate profit on shares

How to treat brokerage, stt,service tax etc? Should we consider only purchase price/sale price or should we add brokerage or all(stt, service tax,TO chrgs, sebi chrgs)?

For F&O SEGMENT

What are the deductions/expenses we can claim while trading in F&O and treating it as a business income. Brokerage,charges,taxes,etc can be deducted?

How bout office rent,newspaper and magazine subscripttions,advisory fees paid,computers and office equipment,salary paid,etc?

plz help