Billing is considered successful when the following criteria are met:
1. Accuracy: The billed amount should accurately reflect the products or services purchased, with correct prices, quantities, and applicable taxes.
2. Timeliness: The transaction should be completed quickly, ensuring that customers do not experience unnecessary delays at checkout.
3. Clear breakdown: The bill should clearly outline the costs of individual items, taxes, discounts, and the total amount to be paid.
4. Customer satisfaction: The customer should feel that the billing process is transparent and fair, without errors or confusion.
5. Payment method compatibility: The system should support various payment options (cash, card, mobile payments) and process transactions securely.
| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |