I only need help with question 18, thank you so much!

Use the following information to answer questions 17-18: 52 weeks HALLO Stock Sym Div Yld PE Vol % (100) 48.72 20.10 Dynegy DYN 1.00 3.3 18 20925 Hi Lo Close Chg 31.55 29.40 30.20 --56 per share on the previous trading day. 17. Dynegy stock must have closed at $29.64 b. $30.76 C. $30.99 d. $31.55 $32.11 e. d 18. Assume the expected growth rate in dividends is 10%. Then the constant growth model suggests that the required return on Dynegy stock is: 7.4% b. 8.9% C. 11.0% d. 13.6% 15.8% e