Sale Price vs Discount Rate
Shoppers often see a final sale price; merchants think in markdown percent. You need both views when negotiating or comparing ads.
From sale price to discount %
discount% = (list − sale) ÷ list × 100
From discount % to sale price
sale = list × (1 − discount/100)
Reverse lookups
When only the paid price and target percent are known, use reverse-percentage tools to recover the original list before tax or coupons.