问题
填空题
按规律填数：15，12，9，______．
答案
15-12=3，12-9=3，所以后面应填：9-3=6．
故答案为：6．
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按规律填数：15，12，9，______．
15-12=3，12-9=3，所以后面应填：9-3=6．
故答案为：6．
An analyst does research about weighted average cost of capital and gathers the following information about a company:
| Capital Source | Market Value (millions) | Before-tax Cost of Capital |
| Bonds | $150 | 5% |
| Preferred stock | $50 | 6% |
| Common stock | $300 | 10% |
A. 7.0%
B. 7.6%
C. 8.1%
