ACC - Calculate the after tax cost of debt

Calculate the after tax cost of debt using the following information (hint: see page 285 in text).
A company issues $2 million at 9% interest with a 15% tax rate.
What is the after-tax cost of debt?

Calculate the cost of issuing preferred stock using the same information above.
What is the preferred stock interest cost?

Using the information above, what are the advantages and disadvantages of both methods?