WASHINGTON (AP) -- Interest rates on short-term Treasury bills rose in Monday's auction from the previous week.

The Treasury Department auctioned $34 billion in three-month bills at a discount rate of 0.045%, up from 0.035% last week. Another $30 billion in six-month bills was auctioned at a discount rate of 0.080%, up from 0.070% last week.

The discount rates reflect that the bills sell for less than face value. For a $10,000 bill, the three-month price was $9,998.86 while a six-month bill sold for $9,995.96. That would equal an annualized rate of 0.046% for the three-month bills and 0.081% for the six-month bills.

Separately, the Federal Reserve said Monday that the average yield for one-year Treasury bills, a popular index for making changes in adjustable-rate mortgages, edged down to 0.11% last week from 0.14% the previous week.

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