Loading and unloading in retail transportation is affected by several factors, including:
1. Time efficiency: The quicker the process, the better it is for maintaining schedules and reducing costs.
2. Labor efficiency: The number of workers required and their skill level can influence the speed and safety of loading/unloading.
3. Safety: Ensuring that goods are safely handled and that no injuries occur during the process.
4. Cost: Efficient handling of goods can reduce transportation costs and prevent damage to goods.
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.