问题
单项选择题
James Investments is calculating an unweighted (equally-weighted) index on a four stock portfolio. Use the following information to calculate the value of the index using the geometric and arithmetic mean.（）
A．0.25
B．3.025
C．1.277
答案
参考答案：C
解析：
First calculate the return relatives and then find the mean of the relatives. The number of shares is irrelevant in this question.
Arithmetic average: 5/5=1; 12.5/10=1.25; 10/7.50=1.33; 8/5=1.60
(1+1.25+1.33+1.60)/4=1.295
Geometric mean: 5/5=1; 12.5/10=1.25; 10/7.50=1.33; 8/5=1.60
(1×1.25×1.33×1.60)1/4=1.277