解释求净现值的公式。设初始投资为X,年回报为10%,期限为Y年,净现值为  = X / (1.1) Y 问两笔投资的净现值大小比较  1 = x1 / (1.1)^y1,P2 = x2 / (1.1)^y2 (1) x1 – x2=2000 (2) y1 – y2 =-2 参考:我选E,P1 –  2 = ( x1* (1.1)^y2 – x2 *(1.1)^y1 ) / (1.1)^(y1+y2) x1 – x2或y1-y2或两者都无法确定上述大小 ------------------------------------ P1/  2= [X1 / (1.1)Y1]/[X2 / (1.1)Y2] =(X1/X2) × (1.1)Y2-Y1=(1+m/X2) × (1.1) Y2-Y1 =(1+2000/X2) × (1.1) ^2 >1 所以P1〉P2 所以应选C吧 大家意见呢?
[此贴子已经被作者于2009/9/9 9:52:07编辑过] |