if Martha is not earning money to pay it back, it would be negative. Each week, she loses -9.72 dollars. so -9.72 x 3 weeks = your problem. I'll let you take it from there and solve the rest
$1750 x 21 days = $36,750 for her daily article
9.72 x 3 weeks = $29.16
$36,750 - $29.16 = $36,720.84
balance = $36,720.84
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