WASHINGTON (AP) — Interest rates on short-term Treasury bills rose in Monday’s auction with rates on three-month bills rising to the highest level since late December.

The Treasury Department auctioned $28 billion in three-month bills at a discount rate of 0.055 percent, up from 0.035 percent last week. Another $20 billion in six-month bills was auctioned at a discount rate of 0.065 percent, up from 0.060 percent last week.