LLD - Design — Library Management System
Design a fine calculation system that applies a 10% discount if total fine exceeds $500. Which component should handle the discount logic?
Design a fine calculation system that applies a 10% discount if total fine exceeds $500. Which component should handle the discount logic?
hard📝 Trade-off Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify where total fine is calculated
The fine calculation service sums all fines and knows the total amount.Step 2: Determine where discount logic fits
Discount depends on total fine, so it should be applied after summing, within the calculation service.Final Answer:
Fine calculation service after summing all fines -> Option CQuick Check:
Discount logic belongs in calculation service [OK]
Quick Trick: Apply discounts after total fine calculation [OK]
Common Mistakes:
MISTAKES- Putting discount in UI or DB
- Separating discount from total calculation
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