EXHIBIT 11.1 LANDSTAR SYSTEM, INC. AND SUBSIDIARY CALCULATION OF EARNINGS PER COMMON SHARE (In thousands, except per share amounts) (Unaudited) Thirteen Weeks Ended --------------------------- March 25, March 27, 2000 1999 ------------ ------------ Earnings available for earnings per share: Net income $ 8,339 $ 7,475 ============ ============ Average number of common shares outstanding 9,169 10,368 ============ ============ Earnings per common share $ 0.91 $ 0.72 ============ ============ 19