Hancock Co.'s December 31, 20x0, balance sheet cointaned the following items in long-term liabilities section:

Unsecured

9.375% registered bonds (25,000 maturing annually beginning in 20x4) - 275,000

11.5% convertible bonds, callable beginning in 20x9, due 2010 - 125,000

Secured

9.875% guaranty security bonds, due 2x10

10.0% commodity backed bonds (50,000 maturing annually beginning in 20x5) - 200,000

What are the total amounts of serial bonds and debenture bonds? show the solution and explain.