Solution: (100-93.25)-(100-94.16) = 0.91In interest rate futures trading, the yield difference is 0.9 1%. 5.7%+0.9 1%=6.6 1%

After hedging with long-term interest rate futures, the real yield of the purchased national debt is 6.6 1%.

Hedging of long-term interest rate futures refers to people buying interest rate futures contracts to avoid possible losses caused by interest rate changes.