What method would likely be used to calculate the original price of an item given a discount?

To determine the original price of an item after a discount has been applied, subtraction is the most appropriate method. When a discount is given, the sale price of the item is the result after the discount amount is subtracted from the original price.

For instance, if an item has an original price of $100 and a discount of $20 is applied, you find the sale price by subtracting the discount from the original price: $100 - $20 = $80.

In this scenario, knowing the sale price and the discount allows you to find the original price by reversing the operation, which is also fundamentally based on subtraction. Therefore, this method is essential for accurately calculating the original price of an item given a discount.