The cost of capital formula is theoretically sound but how easy / difficult is to implement in practice?

Subject: Business    / Finance
Question

q1. The cost of capital formula is theoretically sound but how easy / difficult is to implement in practice?

q2. How does a company’s use of financial leverage impact its risk premium (cost of equity). What does Hamada equation describe?

q3. How would you respond to a firm’s decision to cut dividends?