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"Transformers: Dark of the Moon" pulled in $116.4 million at the box office over the four-day Fourth of July weekend, bringing its total to $181.1 million since opening Tuesday night, according to AP.

The movie, the third installment in the robot franchise about a battle for Earth being waged by shape-shifting machines from another world, also added $217 million overseas, with a worldwide total of nearly $400 million.

Paramount Pictures estimated 60 percent of the box office grosses came from premium-priced 3D ticket sales, giving a boost to the lagging technology which had seen a wane in theater revenue in the last year.

Pixar's animated "Cars 2," which was on top last week, slipped considerably in its second weekend with $32.1 million. The Cameron Diaz comedy "Bad Teacher" dropped to third place with $14.1 million, and newcomer "Larry Crowne," a romantic comedy starring Tom Hanks and Julia Roberts, opened in fourth with $13 million.

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