John B. answered 07/11/15
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The cost of capital (COC) is the weighted sum of the after-tax cost of equity (COE) and the after-tax cost of debt (COD).
You didn't supply a tax rate so I'll assume 36%.
Equity weight = 5/(5+2) = 5/7
Debt weight = 2/(5+2) = 2/7
COE = 16% (note, this is already after tax)
COD = 9% (1-36%) = 5.76%
COC = 5/7(16%) + 2/7(5.76%) = 13.07%