4. Losh Key Corporation common stock is selling for $25.00 per share with an expected cash dividend next year of $1.00. Short term prospects are excellent for Losh Key: a 25% annual growth rate in dividend payments is expected for the three years following next years dividend. After that a normal growth rate of 4% per year forever is expected. What required rate of return is implied by the current $25.00 price?

The answer is supposed to be about 10.58.

I just do not know how to do it.