cost of debt to DMI if the bonds raise the following amounts $($ignoring issuing costs$)?$

a$.$ $$58,230,000$

b$.$ $$53,064,000$

c$.$ $$67,356,000$

d$.$ $$80,232,000$

You are supposed to find the cost of debt to DMI for A$,$B$,$C$,$ and D$.$ IT IS NOT MULTIPLE CHOICE. SOLVE ALL PLEASE