McDonald's Corp. reported worldwide sales grew 5% for the first five months of the year, down from the 7% rate posted for the January-through-April period. Dismayed investors sent the stock lower in trading after the June 9 announcement. Worldwide results include the impact of changing currency values. The weak euro hurt results in Europe, while a stronger Japanese yen helped Asia. In the U.S., sales grew 2% for the five-month period. In trading Friday, McDonald's closed at $33.50, down 7.27% for the week.