Yields on Egypt's Treasury bills mixed at auction

CAIRO (Reuters) - Yields on Egypt's nine-month treasury bills dropped marginally while yields on three-month bills rose slightly at Sunday's auction, the central bank said. The average yield on Egypt's 91-day bill dropped to 11.209 percent from 11.213 percent at the last auction on Nov. 15. The 266-day bill increased slightly to 11.619 percent from 11.617 at a similar auction on Nov. 15. (Reporting by Eric Knecht; Editing by Catherine Evans)