How is this not 8%? They say answer is 7.69% and I have no idea how. Thanks.

If a stock is selling at $250 with a current dividend of $10, what would be the dividend growth rate of this stock, assuming a required rate of return of 12%? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 7.69% b 8.0% Your answer c 9.36%