DuPont’s quarterly profit more than doubles

Chemical maker DuPont Co. continued its turnaround with a strong first quarter performance as business improved across all operating units and market regions.

The company also increased its full-year earnings guidance Tuesday as it reported earnings of about $1.14 billion, or $1.24 per share, for the quarter ended March 31, up from $488 million, or 54 cents per share, a year ago.