US dollar drops sharply against rupee

The US dollar ended sharply lower against the rupee at 64.05/06 per dollar but the pound sterling turned higher at Rs 82.81/83 at the Interbank Foreign Exchange (forex) market here today.
Following are the interbank forex and RBI rates:
(In Rs per Unit)
Unit Interbank RBI Reference US Dollar 64.05/06 US Dollar Rs 64.1188 Pound Sterling 82.81/83 Euro Rs 70.1332 Euro 70.26/28
Japanese Yen (100) 56.45/47.