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T-bill rates hit 2-year high WASHINGTON -- Interest rates on short-term Treasury securities rose in yesterday's auction. The Treasury Department sold \$19 billion in three-month bills at a discount rate of 1.515 percent, up from 1.470 percent last week. An additional \$17 billion was sold in six-month bills at a rate of 1.750 percent, up from 1.725 percent. 