CHICAGO — Fueled by a historic oil boom, North Dakota is on track to enjoy an $850 million budget surplus by the start of fiscal 2013, budget officials said Tuesday.

The state has four reserve funds, which total $1.2 billion. Much of the reserve money is restricted, but some of the accounts are rising by as much as $50 million a month, said Pam Sharp, director of the Office of Budget and Management.

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