1. If a corporation issues a $1000 bond with an annual coupon payment of 7% for 30 years, what are the annual payments? $70
2. How much of the bond will be left to pay off after 10 years?
3. Now suppose that over the 10 years since the corporation issued the bond, interest rates fell. If the corporation issues a new 20-year bond, the required coupon rate will have fallen to 4%. How much will the new annual payments be?

Any help with question 2 & 3 would be appreciated. If you can only help with 1 question 3 is more important.