Wildhorse Tire Co. just paid an annual dividend of $1.20 on its common shares. If Wildhorse is expected to increase its annual dividend by 8.10 percent per year into the foreseeable future and the current price of Wildhorse's common shares is $20.39, what is the cost of common stock for Wildhorse? (Round intermediate calculations to 4 decimal places, e.g. 0.1555 and final answer to 2 decimal places, e.g. 15.25%.) Cost of common stock