What is the cost of capital (range) for the Refining and Marketing division using target capital structure ratios as weights (D/V and E/V)? Corporate tax rate to be considered as 2006 tax rate (Exhibit 1) for Midland Energy Resources up to 2 decimal places XX.XX%. Risk-free rate as 30-year treasury bond rate and market risk premium as 6%. Select one: O a. 10.5%-12.0% O b. 14.0%-15.0% O c. None of the options are correct O d. 6.0%-6.9% O e. 8.0%-8.90%