Weighted contributions extra details

[lgainsbrook]

Weighted contributions are split between several issues: add expense with weighted contributions and display summary. This is leftover information that is useful but I'm not sure where it best fits.

Notifications:

• Participants should receive notifications when the expense calculation changes, such as when new expenses are added or when their weighted contributions are updated.

User Interface:

• The interface should be user-friendly, allowing users to easily enter expenses, assign weights, and view summaries.
• There should be clear labels and instructions for entering and modifying weighted contributions and understanding the final amounts owed or received.

Accuracy and Validation:

• The system should ensure that all calculations are accurate and that the sum of what participants owe matches the total expenses.
• There should be error handling to manage cases where contributions or weights are entered incorrectly.

Accessibility:

• The feature should be accessible on various devices, including mobile and desktop, ensuring that users can manage and view expenses from any platform.

Example Scenario:
Expense Entry:

• Alice, Bob, and Carol go out for dinner costing $150.
• Alice specifies that she will pay $100, Bob $30, and Carol $20.

Weighted Contributions:

• Alice’s contribution is weighted as 66.67% of the total bill, Bob’s as 20%, and Carol’s as 13.33%.

Calculation:

• The system calculates how much each person owes based on their weighted contribution.
• Alice’s share of the bill (66.67% of $150) is $100, Bob’s share is $30, and Carol’s share is $20.
• Based on the payments made, the system determines that Alice overpaid by $50, Bob underpaid by $20, and Carol underpaid by $30.

Display Results:

• The summary shows Alice should receive $50 from Bob and $30 from Carol.
• Bob owes Alice $20 and Carol owes Alice $30.