Suppose you must estimate the cost of equity for a firm, and you have the following data: ref = 3%; rm -rre = 6%; b = 0.7; D1 = $1.00; Po = $20.00; g = 6%; and ra = the firm's bond yield = 6.5%. What is this firm's cost of equity using the DCF approach? 10% 6% 11% O 7% 9%