A wave of pay strikes last month hit nearly a fifth of the country's garment workshops and looks set to force a rise of between 50 and 80 percent in minimum wages.Rock bottom wages and trade deals have made Bangladesh's garments sector a $22 billion industry that accounts for four-fifths of exports, supplying retailers such as Wal-Mart Stores Inc, and Hennes & Mauritz AB.The ILO has been trying to