80. Assume ecsql1.employee_donations has 6 observations, and qtr1 has 6 values
listed below:
100
200
300
.
150
50
What is the value of donation_tot after the 5th DATA step iteration?
data work.donations;
set ecsql1.employee_donations (drop=qtr2-qtr4);
retain donation_tot 1000;
donation_tot + qtr1;
run;
a) 0
b) 750
c) 1750
d) Data step fails due to errors
Answer: C

为什么是1750？ 我算的是1800但是没有这个选项，请大家帮忙解释一下。谢谢！