PPlease help with this homework problem. Please show steps on how to solve and show how to solve on financial calculator if possible.

Consider the following. a. What is the duration of a four-year Treasury bond with a 13 percent semiannual coupon selling at par? b. What is the duration of a three-year Treasury bond with a 13 percent semiannual coupon selling at par? c. What is the duration of a two-year Treasury bond with a 13 percent semiannual coupon selling at par? (For all requirements, do not round intermediate calculations. Round your answers to 2 decimal places. (e.g., 32.16)) a. Duration of the bond years b. Duration of the bond years C. Duration of the bond years