The final price is the merchandise amount after the three percentage reductions. It is not necessarily the checkout total because sales tax, shipping, fees, deposits, and fixed-value coupons may still apply.
Percentage discounts commute mathematically: 20% then 10% gives the same product factor as 10% then 20%. Store rules may still prescribe an order when a coupon is valid only after another condition.
A 100% discount at any stage makes the final price zero. Later percentage discounts cannot reduce it below zero. Three zero discounts leave the original price unchanged.
The displayed currency symbol is generic. Enter one currency consistently and label the result correctly when recording it. No exchange conversion occurs.
Money is displayed to two decimals. A merchant may round after each line, allocate a discount across several items, or round tax under local rules, causing a small difference from calculating on the unrounded total.
To compare promotions, calculate each complete offer against the same eligible original price. Check caps, excluded products, loyalty requirements, return policies, and whether discounts can actually be combined.
A useful check is to multiply the three remaining-price factors. In the example, 0.8 × 0.9 × 0.95 = 0.684, so the customer pays 68.4% of the original price.
To work backward from a final price, divide by the product of the remaining-price factors. For example, if $136.80 remains after factors 0.8, 0.9, and 0.95, dividing by 0.684 recovers the $200 original price. This reverse step assumes no other charge or fixed reduction intervened.
A discount followed by a markup of the same percentage does not return to the starting price because the bases differ. A 20% cut from $100 gives $80, and a 20% increase on $80 gives $96. Keep markdown and markup questions separate.
For multiple items, merchants may apply eligibility and rounding per item rather than to the cart subtotal. Calculate at the same level used by the offer terms when checking a receipt.
If a promotion states “up to” a percentage, enter only the discounts that actually apply to the item. Advertising language is not an additional mathematical reduction. Save the offer terms when checking a purchase or return.