How this number is made
A sale tag that says the percent off lets you recover the pre-sale price by dividing. This is how you check whether the was-price was real. It cannot prove the item ever sold at that price.
- Percent off is the discount, not the percent you pay.
- A 100% discount has no original price in this formula.
Formula
Original = sale price ÷ (1 − percent off).
Worked example
With the figures already in the form, price before the discount is $100.00.
Questions
Does this prove the old price?
No. It only reverses the arithmetic on the tag. A fictional was-price reverses into a fictional original.
What about two discounts?
Reverse them one at a time, or use the stacked-discount page forward with a guess.