NEW YORK, Sept 18 (Reuters) - The U.S. Treasury Department on Monday sold $36 billion of six-month bills at an interest rate of 1.180 percent, the highest level since Oct. 27, 2008 when six-month T-bills were sold at 1.400 percent, Treasury data showed.
A week ago, the Treasury sold six-month T-bills at an interest rate of 1.140 percent.
The ratio of bids to the amounts of six-month bills offered was 3.21, up from 3.12 last week.
The Treasury also auctioned $42 billion of three-month bills at an interest rate of 1.045 percent, matching the level last seen on July 3.
The bid-to-cover ratio at the latest three-month bill sale was 3.05, compared with 3.03 the prior week. (Reporting by Richard Leong; Editing by Bernadette Baum)