Johnson Production Company paid a dividend yesterday of $3.50 per share. The dividend is expected to grow at a constant rate of 10% per year. The price of KayCee's common stock today is $40 per share. If KayCee decides to issue new common stock, flotation costs will equal $4.00 per share. KayCee's marginal tax rate is 35%. Based on the above information, the cost of retained earnings is what? 19.63% or 17.55%