Build ROAS Calculator to solve the stated problem.
Calculates return on ad spend.
Explain the decisions and your personal contribution.

Define the target audience, campaign objective, content or keyword plan, measurable success criteria and an honest sample-results report.
Use the suggested stack as guidance: JavaScript.
Process user data locally where practical; disclose any network transfer.
Use ordinary, edge-case and invalid inputs to test the core behaviour.
Do not include credentials, confidential records or unlicensed assets.

GitHub repository or a clean source ZIP.
README with setup, testing and deployment instructions.
A short case study: problem, approach, features, contribution and results.
Desktop and mobile screenshots or a suitable prototype/demo.
Creator credits linking to the accepted team members’ Mita profiles.

The stated core function works with the supplied test cases.
Invalid input has clear, safe error handling.
The project can be reproduced from the README.
Relevant screens work on desktop and mobile and with keyboard controls.
Claims, privacy notices and creator credits match the implementation.
Mita School reviews the project and checks deployment before publication.