The rupee today tumbled to an all-time low of 54.99 a dollar, just one paise short of the psychological 55 level in pre-close trade due to increased demand for the American currency from banks and importers. The local unit resumed lower at 54.70 a dollar at the Interbank Foreign Exchange (Forex) Market and plunged to a new all-time low of 54.99 against the US dollar at 1640 hours.

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