I think you are making some mistake while doing the calculations.
As per the contract note that i recieved after doing a intraday trade in bank nifty have the charges as below
1. Transaction Chrgs - 27.68
2. Service Tax - 6.77
3. STT - 44.00
4. H.Edu Cess - 0.03
5. Stamp. Chrgs - 50.00
6. Sebi charges - 0.51
7. brokrage - 40.00
So the total comes around 170 rs which is near to 7 banknifty points.
As per the contract note that i recieved after doing a intraday trade in bank nifty have the charges as below
1. Transaction Chrgs - 27.68
2. Service Tax - 6.77
3. STT - 44.00
4. H.Edu Cess - 0.03
5. Stamp. Chrgs - 50.00
6. Sebi charges - 0.51
7. brokrage - 40.00
So the total comes around 170 rs which is near to 7 banknifty points.
Cheers...