How do I make these calculations for the dividends?

I may have the wrong formula

This is the question:

Oriole Mechanical Inc.'s first dividend of $2.8 per share is expected to be paid six years from today. From then on, dividends will grow by 10 percent per year for five years. After five years, the growth rate will then slow to 5 percent per year in perpetuity. Assume that Oriole's required rate of return is 15 percent. What is the price of a share of Oriole Mechanical today?

Oriole Mechanical Inc.'s first dividend of $2.8 per share is expected to be paid six years from today. From then on, dividends will grow by 10 percent per year for five years. After five years, the growth rate will then slow to 5 percent per year in perpetuity. Assume that Oriole's required rate of return is 15 percent. What is the price of a share of Oriole Mechanical today? (Round present value factor calculations to 5 decimal places, e.g. 1.15612. Round other intermediate calculations to 3 decimal places, e.g. 1.156 and final answer to 2 decimal places, e.g.115.61.)