Sorry, I couldn't find pricing data for that day. The closing price for USD in terms of BRL on March 11, 2011 was 1.67. It was up 0.1% for the day. The latest price is 5.33.
DATE
OPEN
HIGH
LOW
CLOSE
March 11 2011
1.66
—
—
1.67
Daily pricing data for USD dates back to 1/1/0001, and may be incomplete.