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The White Corporation has a capital structure of 60 percentcommon equity, 10 percent preferred stock, and 30 percent debt.This capital structure is believed to be optimal.To finance expansion plans over the coming year, the firmexpects to have $40 million in retained earnings available. Thecost of retained earnings is 18 percent. Additional common equitycan be obtained by selling new common stock at a cost of 19.6percent.Preferred stock can be sold at a cost of 15 percent.$25 million in secured bonds can be sold at a pretax cost of 14percent. Beyond $25 million, the firm would have to sell unsecuredbonds (debentures) at a pretax cost of 15 percent. The firm's taxrate is 21 percent.9. What is the firm's lowest weighted cost of capital?a) 15.62% d) 16.82%b) 16.50% e) 15.86%c) 16.58%10. What is the firm's highest weighted cost of capital?a) 15.62% d) 16.82%b) 16.50% e) 15.86%c) 16.58%