Q6.30. Go to the Vanguard website. Look at funds by asset class, and answer this question for bond funds with different durations. 1. What is the current yield-to-maturity of a tax- able Vanguard bond fund invested in Trea- suries? 2. What is the current yield-to-maturity of a taxable Vanguard bond fund invested in investment-grade bonds? 3. What is the current yield-to-maturity of a tax- able Vanguard bond fund invested in high-yield bonds?