A bond portfolio consists of the following three fixed-rate bonds. Prices are per 100 of par value. Bond Maturity Par Value Price Annual Annual Modified Owned Coupon Yield Duration ($) 6 years 2,000 85 2.00% 4.92% 11.0 B 10 years 1,500 80 2.40% 4.96% 17.2 11,00 100 5.00% 5.00% 21.0 15 years What is the portfolio's modified duration? What are the percentage price change for the portfolio and the market value of the portfolio if the semiannual yields for the three bonds increase by 10 bps simultaneously based on the portfolio duration measure