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标题: 请教?????? [打印本页]

作者: invisiblewys 时间: 2006-2-3 16:22 标题: 请教??????

A portion of $6600 is invested at a 5% annual return, while the remainder is invested at a 3% annual return. If the annual income from the portion earning a 5% return is twice that of the other portion, what is the total income from the two investments after one year?

(A) $180
(B) $270
(C) $300
(D) $320
(E) $360

我得出495？？？是理解错误？？

作者: topway5 时间: 2006-2-3 16:39

x * 0.05 = 2 * 0.03 *(6600-x)
x = 3600

=> 3600 * 0.05 * 3/2 = 270

作者: invisiblewys 时间: 2006-2-5 07:34

thanks !!!!!!

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