WASHINGTON (AP) — Interest rates on short-term Treasury bills were mixed in Monday’s auction with rates on three-month bills unchanged and rates on six-month bills rising to the highest level since late March.

The Treasury Department auctioned $25 billion in three-month bills at a discount rate of 0.025 percent, the same as last week. Another $23 billion in six-month bills was auctioned at a discount rate of 0.050 percent, up from 0.045 percent last week.