WASHINGTON (AP) — Interest rates on short-term Treasury bills were unchanged in Monday’s auction.

The Treasury Department auctioned $24 billion in three-month bills at a discount rate of 0.015 percent, the same as last week.

Another $24 billion in six-month bills was auctioned at a discount rate of 0.040 percent, also unchanged from 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 $9,999.62 while a six-month bill sold for $9,997.98. That would equal an annualized rate of 0.015 percent for the three-month bills and 0.041 percent 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 up to 0.11 percent last week from 0.10 percent the previous week.

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