Maxwell Industries has a debtequity ratio of 1.5. WACC is 10 percent, and its cost of debt is 7 percent. The corporate tax rate is 35 percent. a. What is the companys cost of equity capital? b. What is the companys unlevered cost of equity capital? c. What would the cost of equity be if the debtequity ratio were 2? What if it were 1.0? What if it were zero? ( kindly can u explain why are we using wacc equation in question a and why not in question c?)