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Corcovado Pharmaceuticals. Corcovado Pharmaceutical's cost of debt is 6.60%. The risk-free rate of interest is 3.70%. The expected return on the market portfolio is 8.30%. Corcovado's effective tax rate is 35%. Its optimal capital structure is 30% debt and 70% equity. a. If Corcovado's beta is estimated at 0.90, what is its weighted average cost of capital? b. If Corcovado's beta is estimated at 0.60, significantly lower because of the continuing profit prospects in the global pharma sector, what is its weighted average cost of capital