min -4x1—5x2—7x3+x4 s．t． x1+x2+2x3一x4≥1， 2x1—6x2+3x3+x4≤一3， x1+4x2+3x3+2x4=一5， x1，x2，x4≥0．

未分类题If the yield on a 5-year U.S. corporate bond is 7.45% and the yield on a 5-year U.S. Treasury note is 4.33%, the relative yield spread of the bond is closest to:A.3.12%.B.172.06%.C.72.06%.

未分类题A bond portfolio manager is considering three Bonds – A, B, and C – for his portfolio. Bond A allows the issuer to call the bond before stated maturity, Bond B allows the investor to put the bond back to the issuer before stated maturity, and Bond C contains no embedded options. The bonds are otherwise identical. The manager tells his assistant, “Bond A and Bond B should have larger nominal yield spreads to a U.S. Treasury than Bond C to compensate for their embedded options.” Is the manager most likely correct?A.Yes.B.No, Bond A’s nominal yield spread should be less than Bond C’s.C.No, Bond B’s nominal yield spread should be less than Bond C’s.