If you want to show a round price to buyers after the Longwood Loop fee is added, you would take the final price you want to charge, divide by 1.1 and then round to the closest penny. For example, if you wanted to charge $4 for an item, you would divide 4 by 1.1 to get 3.63636363, which would be rounded to $3.64. When the customer sees the price of this item, they will see a price of $4 because it is your price ($3.64) + the Longwood Loop fee ($0.36).