Grandpa Russ thinks he needs a fixed income for the next 10 years. He currently has $10,000 in CDs, which are maturing at the end of this month. The CDs can be renewed for one year at 4 12 percent. Russ calls his broker, Ben Seller, and learns that his $10,000 can be put to better use by purchasing debentures issued by Grab-n-Run, Inc. These bonds are 10-year bonds with a coupon rate of "