LITTLE ROCK, Ark. — Wal-Mart Stores Inc. is cutting 300 administrative jobs at its headquarters as it completes a yearlong series of changes to improve performance. The company has cut almost 14,000 jobs in the past 13 months. Wal-Mart President and CEO Mike Duke told employees about the latest layoffs in a memo on Wednesday. "With this last major strategic piece in place, we are beginning our new fiscal year with every part of our business focused on being even more responsive to our customers," Duke wrote.