Cost of debt. ​Dunder-Mifflin, Inc.​ (DMI) is selling​ 600,000 bonds to raise money for the publication of new magazines in the coming year. The bonds will pay a coupon rate of 12.0 ​% with semiannual payments and will mature in 30 years. Its par value is ​$100 . What is the cost of debt to DMI if the bonds raise the following amounts​ (ignoring issuing​ costs)? a.  ​$45 comma 000 comma 000 b.  ​$54 comma 000 comma 000 c.  ​$66 comma 000 comma 000 d.  ​$75 comma 000 comma 000