Sorry, I couldn't find pricing data for that day. The closing price for Apple (AAPL) on August 20, 2010 was $7.49. It was up 0.1% for the day. The latest price is $258.05.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
August 20 2010
$7.49
$7.62
$7.48
$7.49
384,230,000
Daily pricing data for Apple dates back to 12/12/1980, and may be incomplete.