Jerry and his wife just purchased one U.S. Treasury bond, and they have annual income $300,000, and they will withdraw $20,000 every year for 15 years to purchase treasury bond. The bond will pay a lump sum of $1,000 at maturity, which is exactly 4 years from today. The nominal interest rate is 10%. If the coupon rate is 8%, and compounded semi-annually. How much should they pay for the bond? How many shares of bond could they buy every year?