Can you please help me understand how to solve this problem in excel?

2. Calvin Inc. earned $2.00 per share during the past year and has just paid a dividend of $0.40 per share. Investors forecast that Calvin will continue to retain 80% of its earnings for the next four years and that earnings will grow at 25% per year through year 5. The dividend payout ratio is expected to be raised in year 5 to 50%, reducing the dividend growth rate to 8% thereafter. If Calvin's equity beta is 0.9, the risk-free rate is 8.5%, and the market risk premium is 8%, what should its price be today