CAIRO - Egypt will offer $550 million in 1-year, dollar-denominated treasury bills at a auction on Monday, the central bank said. The bills will roll over $526 million in similar one-year bills that mature on June 18. At its last auction on May 13, the bank sold $1.25 billion of dollar-denominated bills at an average yield of 3.844 percent. The bank introduced the dollar T-bills in November 2011 to help it finance a budget deficit that is running at about 12 percent of gross domestic product..