The six malpractices a fruit and vegetable seller may use to deceive customers are:
1. Weight Manipulation – Using faulty or tampered weighing scales to give less product than what is paid for.
2. Adulteration – Mixing stale or spoiled fruits and vegetables with fresh ones to increase the quantity.
3. Coloring or Waxing – Using artificial colors or wax to make fruits and vegetables appear fresh or ripe when they are not.
4. Overcharging – Charging more than the fair price for fruits and vegetables, often taking advantage of the lack of awareness.
5. Selling Rotten Produce – Selling overripe, rotten, or stale produce as fresh, thereby misleading customers.
6. Misleading Claims – Making false claims about the quality or origin of the produce to mislead the buyer into paying a higher price.
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.