Iron Man Box Office Update has posted box office estimates for the four-day Memorial Day weekend, and it looks like Iron Man got close to The Chronicles of Narnia: Prince Caspian:

Marvel Studios’ Iron Man (Paramount) was still going strong in third, collecting another $25.7 million for the four days to bring its domestic total to $257.8 million. Overseas, the Robert Downey, Jr. starrer has reached $228 million and worldwide the comic book adaptation now stands at $485.8 million after four weeks. The Jon Favreau-directed film was budgeted at $140 million.

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Source: Box Office Mojo