If the S&P 500 earnings / 30-yr T-bond yield is much smaller than average, it's a good signal to buy bonds. (True or False)

Suppose the value of your bond portfolio is $500,000. It has a duration of 13 years. In 2 months, the interest rate increases by 0.46%. Estimate how much your bond portfolio will be worth in 2 months. (margin for error: +/- 500)