Kinslow Manufacturing Company paid a dividend yesterday of $2.50 per share. The dividend is expected to grow at a constant rate of 5% per year. The price of Kinslow's common stock today is $25 per share. If Kinslow decides to issue new common stock, flotation costs will equal $2.00 per share. Keys' marginal tax rate is 34%. Based on the above information, the cost of retained earnings is; a. 16.41%. b. 15.50%. c. 15.00%. d. 10.55%