The average yield on the zero-coupon bond rose to 15.964 percent from 15.329 percent when it was last sold, on June 27.
The yield on the three-year bond also rose to 16.389 percent from 15.521 percent at the last auction, on June 27. The yields on the seven-year bond dropped to 17.353 percent compared with 17.521 at the last similar sale, held on July 25.