20 payments of what?

Enviro Company issues 13.50% 10-year bonds with a per value of $490,000 and semiannual interest payment. On the issue date, the annual market rate for these bonds is 10.50%, which implies a selling price of 129 3/8. The straight-line method is used to allocate interest expense. Using the implied selling price of 129 3/8, what are the issuers cash proceeds from issuance of these bonds? What total amount of bond interest expense will be recognized over the life of these bonds