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.
On the day of her examination, Riya sharpened her pencil from both ends as shown below. 
The diameter of the cylindrical and conical part of the pencil is 4.2 mm. If the height of each conical part is 2.8 mm and the length of the entire pencil is 105.6 mm, find the total surface area of the pencil.