问题
单项选择题
An investor has a $15000 portfolio consisting of $10000 in stock A with an expected return of 20 percent and $ 5000 in stock B with an expected return of 10 percent. What is the investor's expected return on the portfolio（）
A.7.9%.
B.12.2%.
C.16.7%.
答案
参考答案：C
解析：
Find the weighted mean where the weights equal the proportion of $15000. [(10000/15000)×0.20]+[(5000/15000)×0.10]=16.7%.