Retail sales records for restricted products, electronic or written, must be kept for a minimum of three years to ensure compliance with regulatory and legal requirements. This retention period allows for audits, inspections, and tracking of transactions for accountability.
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.