There are several types of merchandise that retailers sell, including:
1. Convenience merchandise: These are products that customers purchase frequently and with minimal effort, such as snacks, toiletries, or groceries. Example: Chips, toothpaste.
2. Shopping merchandise: Products that customers spend more time and effort evaluating before purchasing, such as electronics or clothing. Example: Smartphones, shoes.
3. Specialty merchandise: Items that are unique or highly specialized, often with limited availability, requiring a specific purchase decision. Example: Luxury watches, high-end designer clothing.
4. Impulse merchandise: Items that customers often purchase on a whim, typically located near checkout counters. Example: Magazines, candy bars.
5. Seasonal merchandise: Products tied to specific seasons or holidays, such as Christmas decorations or summer apparel. Example: Halloween costumes, swimsuits.
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.