Options exercise impact cost if I will not close my positions till expiry

suppose if I bought Nifty option 7400 CE and 8400 PE both together@ 980 and the spot is 7850. What is the impact if I will not squre off till expiry. How much I have excess to be paid STT . please explain.

You can see your answer over here, 

http://zerodha.com/z-connect/queries/stock-and-fo-queries/stt-options-nse-bse-mcx-sx

Regards,