please show steps, i need to show work in excel

1) Suppose the company just paid dividend of $1. The dividends are expected to grow at 20% in Year 1 and 15% in Year 2. After that, the dividends will grow at a constant rate of 5% forever. If the required rate of return is 10%, compute today's price of the stock. 2) Suppose the company just paid dividend of $1. The dividends are expected to grow at 25% in Year 1 and 20% in Year 2, and 15\% in Year 3. After that, the dividends will grow at a constant rate of 5% forever. If the required rate of return is 10%, compute today's price of the stock. 3) Suppose the company will not pay any dividend in Year 1. Suppose that the company pays dividend of $2 in Year 2 and after that the dividend will grow at 20% in Years 3 to 5 . After that the dividends will grow at a constant rate of 6% forever. If the required rate of return is 10%, compute today's price of the stock