Cost of debt. $$Dunder$-$Mifflin, Inc.$($DMI$)$ is selling$600,000$ bonds to raise money for the publication of new magazines in the coming year. The bond will pay a coupon rate of $15\mathrm{.}3\%$ with semiannual payments and will mature in $30$ years. Its par value is $$$$100.$ What is the cost of debt to DMI if the bonds raise the following amounts$($ignoring issuing$$ costs$)?$

a$.$$$58,416,000$

b$.$$$53,202,000$

c$.$$$62,124,000$

d$.$$$70,740,000$