Robin invested a total of $12,000 in two investments, X and Y, so that the investments earned the same amount of simple annual interest. How many dollars did Robin invest in investment Y ? Investment X paid 3 percent simple annual interest, and investment Y paid 6 percent simple annual interest. Robin invested more than $1,000 in investment X.

Robin invested a total of $12,000 in two investments, X and Y, so that the investments earned the same amount of simple annual interest. How many dollars did Robin invest in investment Y ?

Investment X paid 3 percent simple annual interest, and investment Y paid 6 percent simple annual interest.
Robin invested more than $1,000 in investment X.

A、Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B、Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C、BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient.
E、Statements (1) and (2) TOGETHER are not sufficient.

答案：A

专业教师答疑

问题：单利计算利息是本金×年利率×年(时间)，这个题目只是说X和Y有一样的利息，但是并不知道X和Y的投资的时间，怎么能得到1充分2不充分的啊？查看答疑

问题：老师我认为条件一的式子是（1+3%）a+（1+6%）b=12000 不成立条件二是a=1000+b a+b=12000 成立选B 查看答疑

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