问题
单项选择题
Gary McDermott runs a two-person investment management firm. McDermott invests a stock by an equal amount of money into a family account each year for four years as follows:
McDermott's average cost per share is closest to:()
A.€17.04
B.€17.64
C.€18.25
答案
参考答案：A
解析：
计算式如下：4/(1/12+1/19+1/17+1/25)=17.04(€)。