5-Suppose the Debt over equity ratio (D/E) for a company is 2.3. The yield to maturity on the bonds is 8% and the cost of retained earnings is 14%. The companys tax rate is 40%. What is the WACC of this company based on the information given?

a) 7.56%

b) 7.12%

c) 6.59%

d) 5.25%

e) 8.12%

f) None of the above

I will rate! I need to see the work/formulas. Thank you!