Can someone explain how to do this? The answer is shown in red. I need to solve this using a ti-84, so no excel.

6. Sundae corp. just paid the annual dividend of $1.20. It will pay $1.50, $1.60, and $1.70 as annual dividend for year 1, 2, and 3. Then, the annual dividend will grow at a constant growth rate of 10% from year 4. If the required rate of return on stock investment is 15%, what is the price of Sundae's stock now? Po= $28.223