Please show which function in excel is being used to calculate. I kindly need step by step instruction on how to get the answer for this question please.

Halliford Corporation expects to have earnings this coming year of $2.687 per share. Halliford plans to retain all of its earnings for the next two years. Then, for the subsequent two years, the firm will retain 51% of its earnings. It will retain 20% of its earnings from that point onward. Each year, retained earnings will be invested in new projects with an expected return of 18.5% per year. Any earnings that are not retained will be paid out as dividends. Assume Halliford's share count remains constant and all earnings growth comes from the investment of retained earnings. If Halliford's equity cost of capital is 8.1%, what price would you estimate for Halliford stock? The stock price will be $ (Round to the nearest cent.)