Two important merchandising tips for retailers include:
1. Strategic product placement: Place high-demand items at eye level to attract more attention and boost sales.
2. Create appealing displays: Design engaging and aesthetically pleasing product displays that encourage customers to browse and purchase.
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.