Question 1 6.25 pts An investor owns three bonds in a portfolio. The first bond is valued at $3,000 and has a Macaulay duration of 8.5 years. The second bond is valued at $2,000 and has a Macaulay duration of 2.5 years. The third bond is valued at $7,000 and has a Macaulay duration of 5.0 years. What is the duration of the investor's entire portfolio? 20 O 6.25 years 16 years 5.33 years 5.46 years 4 years