Retail giant Wal-Mart Stores Inc on Thursday posted a 2.7 per cent rise in June same-store sales and added total sales for last month jumped 11.1 per cent to $24.6 billion from $22.1bn in the year-ago period. The Arkansas-based operator of more than 4,500 stores said its Wal-Mart division enjoyed a 2.4 per cent rise in comparable sales with total sales at the unit in the five weeks to July 4 up 9.5 per cent year-on-year to $15.2bn.