Rupee drops by 20 paise against US dollar

The rupee today closed down by 20 paise at 64.24/25 per US dollar against the previous close of Rs 64.04/05 per dollar.
The pound sterling finished lower at Rs 85.81/83 at the Interbank Foreign Exchange (forex) market here.
Following are the interbank forex and RBI rates:
(In Rs per unit) Unit
Interbank
RBI Reference US Dollar

64.24/25
US Dollar Rs 64.1065 Pound Sterling
85.81/83
Euro
Rs 75.4277 Euro
75.74/76 Japanese Yen (100) 57.