For any TV Size, 36.05 % duty applicable on import of high-end flat screen (LCD/LED), Plasma television sets with effect from August 26 2013. You also have to take the bill with you, otherwise they will asses based on their own yardsticks for the cost of the TV. Read the following link for more details on the tax.

"http://www.thehindu.com/business/Economy/3605-duty-on-import-of-highend-...

For exchange rates, effective from 15th may check the following link.

http://www.cbec.gov.in/customs/cs-act/notifications/notfns-2014/cs-nt201...

So they will charge you @16.70 per QR.

For Ex. if your TV costs QR.2500 then you will pay tax = 2500 x 16.70 x 36.05% = INR: 15,050.88.