An investor enters a long position in a corn futures contract at $6.58 /bushel. The contract unit is 5,000 bushels. The initial margin is $2,860 and the maintenance margin is $2,600. The futures price rises to $6.605/ bushel at the end of the first day and $6.6525/ bushel on the end of the second day. (1) What price change would lead to a margin call? (2) Under what circumstances could \$1,000 be withdrawn from the margin account