WASHINGTON (AP) — Interest rates on short-term Treasury bills were mixed in Monday’s auction with three-month bills unchanged and six-month bills dropping to their lowest level in three weeks.

The Treasury Department auctioned $26 billion in three-month bills at a discount rate of 0.025 percent, unchanged from last week. Another $24 billion in six-month bills was auctioned at a discount rate of 0.055 percent, down from 0.060 percent last week.