Consider the following a. What is the duration of a four-year Treasury bond with a 10.5 percent semiannual coupon selling at par? b. What is the duration of a three-year Treasury bond with a 10.5 percent semiannual coupon selling at par? c. What is the duration of a two-year Treasury bond with a 10.5 percent semiannual coupon selling at par? (For all requirements, do not ro und intermediate calculations. Round your answers to 2 decimal places.(e.g.. 32.16) a. Duration of the bond b. Duration of the bond C. Duration of the bond years years