Two marketing tools commonly used by retailers include: - Sales Promotions: Short-term incentives to encourage customer purchase, such as discounts and coupons. - Advertising: Public communication used to promote products or services through various media.
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.