need help with the calculations. please show your work.

IV. A financial analyst following Fast Start Inc., a new high-growth company, estimates a 15 percent required return on Fast Start's stock. The current dividend per share is $1.00, and the company's dividend is expected to grow at a rate of 25% this year, 20% next year, and 15% the following year. After three years the dividend is expected to grow at a constant rate of 7% per year, forever, what is the current stock price