Solve the problem.During the first five months of the year, Len earned commissions of $3850, $2790, $2450, $2360, and $3580. If Len must have average monthly earnings of at least $3140 in order to qualify for retirement benefits, what must he earn in the sixth month in order to qualify for benefits?
A. at least $3810
B. at least $3006
C. at least $3028
D. at least $3140
Answer: A
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