how do you solve for MacD??

Question 11 Homework Unanswered An Apple annual coupon bond has a coupon rate of 6.6%, face value of $1,000, and 4 years to maturity. If its yield to maturity is 6.6%, what is its Macaulay Duration? Answer in years, rounded to three decimal places. Type your numeric answer and submit Question 12 Homework Unanswered Consider an annual coupon bond with a coupon rate of 8.3%, face value of $1,000, and 2 years to maturity. If its yield to maturity is 3.4%, what is its Macaulay Duration? Answer in years, rounded to three decimal places. Type your numeric answer and submit