Evaluate Joanna Cohen's estimation of cost of capital: a. Is it appropriate to use a single cost of capital for all Nike's businesses? Explain. b. How does Joanna Cohen calculate the weights for debt and equity? Do you agree with these calculations? Why? (If you do not agree, show your calculations) c. How does she calculate cost of debt? Do you agree with these calculations? Why? (If you do not agree, show your calculations) d. How does she calculate cost of equity? Do you agree with these calculations? Why? (If you do not agree, show your calculations)