Bread, milk, and groceries are considered staple products because they are essential and regularly purchased items. These products meet basic needs and are typically bought on a frequent, habitual basis.
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.