Rhonda Stallings established a long position on a 5,000 bushel CBOT Novem-ber 2005 soybean future, and twelve days later she closed the position. The ini-tial margin requirement was $1,485, and the maintenance margin was $1,100.At the time she established her position, the futures price was $30,500 (610cents per bushel), and she closed her position when the futures price was$29,300. In addition to her initial deposit of $1,485, she made a deposit of$600 to her margin account six days after she established her position. FindRhondas annual effective yield for the twelve-day period during which her long position was open.