need help on both a.) and b.)

please and thank you!

The Mariner Boat Co. just paid a dividend of $3.00. Dividends are projected to grow by 15%,10% and 7.5% during the next three years. After that, dividends are projected to grow at a constant rate of 3%, indefinitely. Market participants view the risk in the company as above that of the market - at a BETA of 1.1 . If the risk-free rate =4% and the expected market risk premium for the coming year is 6.5%. a. Compute the intrinsic value of Mariner; b. the stock is currently trading at $48. What is your recommendation to your portfolio manager