WASHINGTON — The federal government ran a $75 billion budget surplus in September after posting an unrevised $190.5 billion deficit the previous month, the Treasury Department reported Friday, resulting in a final fiscal year 2012 deficit of $1.1 trillion.

The September surplus represents a nearly $138 billion switch from the $62.8 billion gap in September 2011, and was the second surplus of the fiscal year. April saw a $59.1 billion surplus.

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