第1个回答 2013-03-13
解:(1)设商铺标价为x万元,则
按方案一购买,则可获投资收益(120%-1)•x+x•10%×5=0.7x,
投资收益率为0.7xx×100%=70%,
按方案二购买,则可获投资收益(120%-0.85)•x+x•10%×(1-10%)×3=0.62x,
投资收益率为0.62x0.85x×100%≈72.9%,
∴投资者选择方案二所获得的投资收益率更高;
(2)设甲投资了x万元,则乙投资了(0.85x)万元.
由题意得0.7x-0.62x=5,
解得x=62.5,
乙的投资是62.5×0.85=53.125万元
∴甲投资了62.5万元,乙投资了53.125万元.
第2个回答 2013-01-11
不知道对不对,我算数也不太好,仅供参考,错了不要说我哈
首先设投资了X万元
方案一五年后的收益:X=5*0.1X+0.2X=0.7X
方案二五年后的收益:0.85X=3*0.1X-(3*0.1X*0.1)+0.2X=0.55X
方案一和方案二五年后差额为5万那就成等式就可以了
0.7X-0.55X=5 X=33.3
甲投资了33.3万 乙投资了28.3万来自:求助得到的回答
第2个回答 2013-01-11
我有准确答案
解(1 )设商铺标价为x万元则 按方案一购买则可获投资收益120%1·xx·10%×50.7x„„„„„1分 投资收益率为0.7xx×100%70%„„„„„„„„„„„„„„„„„„„„„2分 按方案二购买则可获投资收益120%0.85·xx×10%×(110%)×30.62x3分 ∴ 投资收益率为0.62x0.85x×100%≈72.9% „„„„„„„„„„„„„„„„„4分 ∴ 投资者选择方案二所获得的投资收益率更高 „„„„„„„„„„„„„„5分(2) 由题意得0.7x0. 62x5 „„„„„„„„„„„„„„„„„„„„„6分 解得x62.5万元 „„„„„„„„„„„„„„„„„„„„„„„„„7分 ∴ 甲投资了62.5万元乙投资了53.125万元„„„„„„„„„„„„„„„(8分)本回答被提问者采纳
第3个回答 2013-02-24
解:(1)设商铺标价为x万元,则
按方案一购买,则可获投资收益(120%-1)•x+x•10%×5=0.7x
投资收益率为
07x÷x×100%=70%
按方案二购买,则可获投资收益(120%-0.85)•x+x•10%×(1-10%)×3=0.62x
投资收益率为
0.62x÷0.85x×100%≈72.9%
∴投资者选择方案二所获得的投资收益率更高.
(2)由题意得0.7x-0.62x=5
解得x=62.5万元
∴甲投资了62.5万元,乙投资了53.125万元