Solve the problem.During the first four months of the year, Jack earned 
and 
If Jack must have an average salary of at least 
in order to earn retirement benefits, what must Jack earn in the fifth month in order to qualify
for benefits?
A. at least $848
B. at most $855
C. at least $680
D. at most $820
Answer: C
Mathematics
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A. 
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C. 
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