Question 356828
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Hi,
Total earned for the month would be the base plus the commission 
Let s be the total monthl sales
4455 = 1280 + .125*s
3175 = .125*s
3175/.125 = s
$25,400 = s
check your answer
$1280 + .125($25,400) = $1280 + $3175 = $4455