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SAS Certified Base Programmer 123 Questions (68)

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. 5
B. 20
C. 100
D. 500

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