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The formula to calculate the amount of discount from an original price is derived from the relationship between the discount amount and the original price. By taking the amount of discount and dividing it by the original price, you obtain the percentage of the original price that the discount represents, thus giving you the percentage reduction. This formula effectively quantifies how much the price has been reduced in percentage terms, allowing for straightforward comparison and understanding of discounts.

In this context, using the sale price in place of the original price, as suggested by another choice, would yield a different ratio that does not accurately reflect the percentage reduction in relation to the original price. Other options either confuse the relationship of price and discount or misrepresent how to calculate a new price based on percentage increases. Therefore, the first choice correctly captures the method to find the percentage discount based on the original price.