gwd 12 Q18

netbanker · 发表于 2009-11-29 15:30:21

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

answer is : 1/2r+3

请看看怎么解得,xiexie.

lovesasa0820 · 发表于 2009-11-29 15:38:40

设H今年省了x元，那么明年他能花X（1+r）
这个是他今年花的1/2，那么今年他花了2X（1+r）
他今年总的收入2X（1+r）+x
x除上面那个总收入，X约掉answer is : 1/2r+3

yolanda1204 · 发表于 2009-11-29 15:43:46

X(1+R)=1/2(1-X) , X=1/（3+2R）

netbanker · 发表于 2009-12-1 06:03:26

明白了，题目太绕没看懂。。。。谢谢楼上的美女们。

gwd 12 Q18

所属分类: GMAT考试

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