Answer (D) is correct . A weighted average of the costs of all financing sources should be used, with the weights determined by the usual financing proportions. The terms of any financing raised at the time of initiating a particular project do not represent the cost of capital for the firm. When a firm achieves its optimal capital structure, the weighted-average cost of capital is minimized.
Answer (A) is incorrect because The cost of capital is a composite, or weighted average, of all financing sources in their usual proportions. The cost of capital should also be calculated on an after-tax basis. Answer (B) is incorrect because The cost of capital is a composite, or weighted average, of all financing sources in their usual proportions. The cost of capital should also be calculated on an after-tax basis. Answer (C) is incorrect because The cost of capital is a composite, or weighted average, of all financing sources in their usual proportions. The cost of capital should also be calculated on an after-tax basis.
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