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Oil jumped by more than $4 Friday, the biggest gain in a month, following a report that more U.S. jobs were created in July than economists had expected, Bloomberg reported.

Crude futures rose $4.29 to finish the week at $91.42 a barrel on the New York Mercantile Exchange.

It was the biggest single-day increase since June 29, Bloomberg said.

The Labor Department reported Friday that while the topping forecasts.