How much Customs Duty will be charged on excess $350

I am going back to india after a stay of 45 days in US.

I bought few small electronic gift items (upto $2 to $13 each) costing around $200 in total. I am also planning to buy a handycom worth $400. So, the total amount would be app. $600. As upto $250 is durty free..any idea how much would they charge as a duty on excess $350.