The market formula allows the setting of multiple exchange prices for the same product, considering factors like demand, competition, and market conditions. It enables flexibility in pricing strategies to cater to different market segments.
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.