Retail giant Coles Myer Ltd on Friday posted a 5.5 per cent year-on-year climb in first half sales to A$13.8 billion (US$8.2bn) and reaffirmed its full-year earnings guidance of A$425 million to A$435m (US$252m-US$258m). The Melbourne-based firm said first half sales at its discount department stores Kmart and Target continued to improve, with sales up 9.5 per cent and 8.6 per cent, respectively.