please answer A & B, i prefer B if you cant do both. please show work/formulas. thank you !

29. Find the duration of a 6% coupon bond making annual payments if it has 3 years until maturity and has a yield to maturity of 6% [1-( itlog) 2:31.00 It 06 -2.673 yrs 2.078 445 1.06 - 2:833 yrs The duration is 2.83 years. 30. Find the duration of the bond in problem if the coupons are paid semi-annually. 2