NO.PZ2018062016000006
问题如下:
Lucy believes that after retirement she will need about $2 million totally for her daily expenses. At present, she has $1million investment at a stated annual interest rate of 2.5%. Assuming compounded daily, how long does it take for Lucy to have enough money for retirement life?
选项:
A.27.73 years
B.28.07 years
C.26.48 years
解释:
A is correct.
EAR=(1+0.025/365)365-1=0.02531
$1million*(1+0.02531)N =$2million, N=27.73 years.
理解先求EAR再计算器的做法,但是第二种解法(直接使用计算器的方法)中,I/Y=2.5/365,这里不明白,2.5%为什么要÷365之后才能作为I/Y?题目中“stated annual interest rate of 2.5%.”不也是年为单位吗。