the market value of charter cruise company's equity is $$15$ million, the market value of its debt is $$5$ million and you have $$5$ million in preferred stock outstanding as well. If the required rate of return on the equity is $20\%,$ the return on preferred stock is $12\%,$ and that on the debt is $8\%,$ what is the company's cost of capital? You pay a tax rate of $25\%.$