By Donna Kardos Yesalavich Of DOW JONES NEWSWIRES NEW YORK (Dow Jones)--U.S. stocks tumbled Friday, with Bank of America, JPMorgan Chase and Alcoa leading the Dow Jones Industrial Average's components lower as investors again grew concerned about the economy after the short-lived excitement over Thursday's good report on gross domestic product.The Dow Friday posted its biggest one-day point drop since April 20, and ended October just 0.45 point above where it began. Other major measures, including the Standard & Poor's 500 and the Nasdaq Composite, ended the month in the red, marking their first monthly declines since February.The Dow closed down 249.85 points, or 2.51%, at 9712.73, marking its 10th triple-digit movement this month. Five of them were down and five up, reflecting how volatile...