Merchandising is the process of promoting and selling products through the use of displays, product placements, pricing strategies, and advertising in retail environments. It involves selecting and presenting the right products to the right customers at the right time, maximizing the sales potential and customer satisfaction.
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.