please do in excel and show how you got the answer in excel

Summit Pharmaceuticals has a cost of debt of 7.5 percent and an unlevered cost of capital of 12.7 percent. Assuming a tax rate of 22 percent, what is the target debt-equity ratio if the targeted cost of equity is 14.5 percent? 1) What is the target debt-equity ratio if the targeted cost of equity is 14.5 percent? 2) What would be the company's WACC increase if it implements a D/E ratio of 1.00 and the tax rate increases to 25 percent? SHOW YOUR WORK