单选题
Gary Michael, CFA, the portfolio manager of several aggressive-growth mutual funds. Michael opened a new account on 1 January 2010 with 
850 000 and presented the following information:
850 000 and presented the following information:
【正确答案】
B
【答案解析】[解析] 计算式如下：0=-850000-6000001(1+r)1-1000001(1+r)2+18500001(1+r)2，
用计算器的CF功能求出r=12.47%。
用计算器的CF功能求出r=12.47%。