US dollar firms up against the rupee

The US dollar firmed up further against the rupee at 56.50/51 per dollar and the Pound Sterling also finished higher at Rs 85.97/99 per pound at the close of the Interbank Foreign Exchange Market (Forex) today.
Following are the Interbank Forex and RBI rates:
(In Rs Per Unit)
Unit Interbank RBI Reference US Dollar 56.50/51 US Dollar Rs 56.4958 Pound Sterling 85.97/99 Euro Rs 73.6807 Euro 73.39/41
Japanese Yen (100) 56.