T-Bill Rates Fall: Rates on 52-week Treasury bills fell at auction to the lowest level in six months. The average discount rate was 5.90%, down from 6.02% at the last auction March 30. It was the lowest rate since the bills averaged 5.72% on Oct. 13. The bills will carry an equivalent coupon interest rate of 6.28%, with a bill with a face value of $10,000 selling for $9,403.40. Sales totaled $17.88 billion out of bids of $64.47 billion.