How do I solve this problem? In Excel.

c Understanding the relationship between ROE, plowback ratio, and the sustainable growth rate What proportion of earnings is being plowed back in the firm (retained earnings) if the sustainable growth rate is 7.0% and the firm's return on equity (ROE) is 17.3% ROE Sustainable growth rate (9)- 17.3% 7.0% Plowback ratio- d Understanding the relationship between dividend and stock price What should be the price for a stock paying an annual dividend of S 1.50 if the expected growth rate is zero and the expected or required rate of return for the stock is 5.5% ? Annual dividend= $ 1.50 E(r) 5.5% Current market price