Question: A portfolio of short-term bonds has one-, two-, and three-year rate durations of 0.49, 0.81, and 1.41, respectively. Currently, the appropriate one-, two-, and three-year yields are 2.49%, 2.99%, and 3.03%, respectively. What is the approximate percentage change in the portfolio value if the one-year yield changes to 2.68%, the two-year yield to 2.96%, and the three-year yield to 3.53%?