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.
请问 EAR保留几位小数,本题答案中0.02531,将A选项带入后的得出1.99992867,并不大于2.
而实际EAR为0.025314...,若多保留一位,A选项成立。