Singapore Dollar Weakens Against Greenback

*World Bank Raises Pakistan Flood Aid To $1bn From $900mn

*IMF Lowers South Korea 2011 GDP Growth Forecast To 4.5% From 5%

*IMF Raises South Korea 2010 GDP Growth Forecast To 6.1% From 5.8%

*South Korea August Foreign Reserves Fall To $285.4bn From $286bn In July