LLD - Design — Splitwise (Expense Sharing)
Why is it important to validate that percentage splits sum to 100% in a billing system?
Why is it important to validate that percentage splits sum to 100% in a billing system?
hard🧠 Conceptual Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand allocation correctness
Sum of percentage splits must be exactly 100% to allocate the entire amount correctly.Step 2: Prevent billing errors
If sum is not 100%, users may be overcharged or undercharged.Final Answer:
To ensure the total amount is fully allocated without over or under charging -> Option DQuick Check:
Valid percentage sum = 100% [OK]
Quick Trick: Percentages must total 100% to avoid billing errors [OK]
Common Mistakes:
MISTAKES- Ignoring sum validation
- Allowing arbitrary percentages
- Confusing with exact splits
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