Contact person: Business Client

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Location: Hollywood, United States

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need a clear, spreadsheet-ready formula to calculate Return on Investment (ROI). The only input I will have available at run-time is the period of investment; everything else must be derived or handled within the formula itself, along with concise notes that explain the logic so I can maintain it later.

Please deliver:

• An ROI formula that works in Excel or Google Sheets.
• A brief annotation, right next to the formula, describing how each part deals with the missing variables.

Accuracy matters more than elegance, but I do want the final cell to display ROI as a clean percentage." (client-provided description)