Project Profitability Audit Kit — Revenue, Cost, Profit & Margin per Project (Python Script + Fictional Sample)

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Description

Python 3 script for freelancers and small studios who track time and expenses in CSVs: computes revenue, cost, profit, margin, and unbilled value per project, flags every duplicate or invalid row instead of guessing, and includes a fictional sample with passing tests. Standard library only; no account or billing system is connected and no profit result is promised.