题目：
An investor purchased on margin 1000 shares of a stock priced at $ 50 per share. The investor borrowed the maximum amount allowed by the initial margin requirement of 60 percent. The maintenance margin is 30 percent. The lowest price share at which the stock could sell before the investor would receive a margin call is closest to:
A．
| A. $15.00. |
B．
| B. $25.00. |
C．
| C. $28.57. |
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
