Pacific Sunwear of California Inc. (Nasdaq:PSUN) Thursday reported sales of $43.4m for the four-week period ended July 30, 2000, an increase of 29.2 per cent over sales of $33.6m for the comparable four-week period ended Aug. 1, 1999. Company same-store sales decreased 4.4 per cent for the period with PacSun same-store sales down 4.