单项选择题:
An analyst wants to calculate an appropriate price to earnings (P/E) ratio for a pany that operated in mining industry using the following information. The pany's average return on equity was determined to be 13. 3 percent during the four-year period ending in 2011, and that the pany's book value per share was $8.45 at the beginning of that period but had increased to $12.36 in 2011. If the pany's stock is priced at $40 per share, the appropriate P/E is closest to:（）
A. 24.3 B. 28.9 C. 56.4
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答案：A
解析: 如果对于盈利比较波动的公司，我们在计算P/E时有两种方法：一种是将过去几年的收益(earnmgs)移动平均，另外一种是将ROE移动平均，再乘以最近一年的每股净资产(book value)，前者没有考虑公司规模的改变，后者考虑了公司规模的改变，但都可以用于平滑市盈率，使其显得不那么波动。$40/(13.3%×$12.36)=24.3。