请教GWD第7套Q28

pausa1087 · 发表于 2009-12-8 16:28:14

请教GWD 第7套 Q28:

This year Henry will save a certain amount of his income, and he will spend the rest. Next year Henry will have no income, but for each dollar that he saves this year, he will have 1 + r dollars available to spend. In terms of r, what fraction of his income should Henry save this year so that next year the amount he was available to spend will be equal to half the amount that he spends this year?

A. 1/(r+2)

B. 1/(2r+2)

C. 1/(3r+2)

D. 1/(r+3)

E. 1/(2r+3)

为什么答案是E呢？谢谢！

sharonyyyy · 发表于 2011-9-16 12:13:52

我也想知道...

lynnzj · 发表于 2011-9-16 12:55:33

设income为M 今年save了S 今年rest：M-S 问题的意思是求S与M的比值
今年存的钱到明年加上利息就变成了S（1+r）就是明年可以花的钱
今年可以花的钱是M-S
根据题目的意思明年可以花的钱是今年的一半可以得出等式
S（1+r）\ （M- S）= 1\ 2. 可以算出S\M = 1\（3+2r）

请教GWD第7套Q28

所属分类: GMAT考试

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