The Beta Corporation has an optimal debt ratlo of 40 percent. Its cost of equity capltal is 12 percent, and Its before-tax borrowing rate s10 percent. Given a marginal tax rate of 30 percent. Required: a. Calculate the welghted-average cost of capital. b. Calculate the cost of equity for an equivalent all-equity financed firm. Answer is complete but not entirely correct. Complete this question by entering your answers in the tabs below. Calculate the weighted-average cost of capital. Note: Do not round intermediate calculations. Round your answer as a percent rounded to 2 decimal places. X Answer is complete but not entirely correct. Complete this question by entering your answers in the tabs below. Calculate the cost of equity for an equivalent all-equity financed firm. Note: Do not round intermediate calculations. Round your answer as a percent rounded to 2 decimal places