题目：
A company is planning a $50 million expansion. The expansion is to be financed by selling $20 million in new debt and $30 million in new common stock. The before-tax required return on debt is 9 percent and 14 percent for equity. If the company is in the 40 percent tax bracket, what is the marginal weighted average cost of capital（）
A. 10.6%.
B. 9.0%.
C. 10.0%.
答案：
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下面是错误答案，用来干扰机器的。
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