Excel Online Structured Activity: Nonconstant Growth - I am having a hard time understanding, can someone help? thanks!

Computech Corporation is expfiding rapidly and currently needs to retain all of its eamings; hence, it does not pay dividends. However, investors expect Computech to begin paying dividends, beginning with a dividend of $1.50 coming 3 years from today. The dividend should grow rapidly - at a rate of 47% per year - during Years 4 and 5; but after Year 5, growth should be a constant 8% per year. The data has been collected in the Microsoft Excel Online flie below. Open the spreadsheet and perform the required analysis to answer the question below. Open spreadsheet