呵呵~~大家好，想请问这题，因为觉得do year = 2000 to 2005 by 5只有5次循环，因此，答案应该是A才对，但是标准答案为什么是D, 25呢？？请高手指点阿！！
QUESTION 38
The SASDATA.BANKS data set has five observations when the following SAS
program is submitted:
libnamesasdata 'SAS-date-library';
data allobs;
set sasdata.banks;
capital=0;
do year = 2000 to 2020 by 5;
capital + ((capital+2000) * rate);
output;
end;
How many observations will the ALLOBS data set contain?
A. 5
B. 15
C. 20
D. 25
Answer: D