Hancock Co.’s December 31, 2006 balance sheet contained the following items in the long-term liabilities section:

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Unsecured

9.375% registered bonds ($25,000 maturing annually beginning in 2010)

$275,000

11.5% convertible bonds, callable beginning in 2014, due 2026

125,000

Secured

9.875% guaranty security bonds, due 2026

$275,000

10.0% commodity backed bonds ($50,000 maturing annually beginning in 2011)

200,000

What are the total amounts of serial bonds and debenture bonds?

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Serial bonds

Debenture bonds

a.

$475,000

$400,000

b.

$475,000

$125,000

c.

$450,000

$400,000

d.

$200,000

$650,000