Please show all work. Thank you! Also 15. please

Luther Industries has 25 million shares outstanding trading at $18 per share. In addition, Luther has $150 million in outstanding debt. Suppose Luther's equity cost of capital is 13%, its debt cost of capital is 7%, and the corporate tax rate is 21%. 13) Luther's unlevered cost of capital is : 14) Luther's weighted average cost of capital is: Use the following information to answer the question(s) below. Nielson Motors (NM) has no debt. Its assets will be worth $600 million in one year if the economy is strong but only $300 million if the economy is weak. Both events are equally likely. The market value today of Nielson's assets is $400 million. 15) The expected return for Nielson Motors stock without leverage is: Use the information for the question(s) below