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The following SAS program is submitted:


data work.total;
set work.salary(keep = department wagerate);
by department;
if first.department then payroll = 0;
payroll + wagerate; if last.department; run;


The SAS data set WORK.SALARY, currently ordered by DEPARTMENT, contains 100 observations for each of 5 departments.


Which one of the following represents how many observations the WORK.TOTAL data set contains?

A. 500
B. 5
C. 20
D. 100


Answer: B