A company has a financial structure consisting of 30% debt and 70% equity. If the eta of the firm's assets is 0.8 and the debt is risk-free. Calculate:

a) The eta of the company's shareholders.

b) Assuming a risk-free rate of 5% and a risk premium of 8%, determine the return required by the company's shareholders and the return on the company's assets.

c) Represent graphically.