What you need is one of the web pages that give this update every day, if not more often.
X-rates.com for instance.
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X-rates.com for instance.
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How Many US Dollars Are Equal To One Indian Rupee?
It changes time to time so it cannot be answered correctly but till now its cost is Rs. 50.19
1 INR = 0.0225978 USD
One Indian rupee = 0.0225978 US dollars
Current value on 5/01/2007
One Indian rupee = 0.0225978 US dollars
Current value on 5/01/2007