The risk free rate of return is 2% and the market risk premium is 10%. Twindle Industries has a beta of 1.5 and a standard deviation of returns of 18%. Twindle's marginal tax rate is 35%. Analyst's expect Twindle's dividends to grow by at least 5% per year for the next 5 years. Using the capital asset pricing model, what is Twindle's cost of retained earnings?

12%

13%

17%

14%