Compute the price after a percentage discount.
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Multiply original price by discount percent to get amount saved; subtract for sale price.
Same math retailers use on price tags.
This is also useful in reverse — if you know the sale price and discount percent but want the original price, divide the sale price by (1 − discount%) to check whether a 'was' price on a tag is accurate.
$80 item at 25% off: save $80 × 25% = $20, sale price $60.00.
Rarely on everything — usually just the most-discounted single item. Most items on a sale are marked down less than the headline.
Multiply, don't add. 20% + extra 10% = 0.80 × 0.90 = 72% of original, or 28% total off — not 30%.
No — multiplying percentages is commutative, so 20% off then 10% off gives the identical final price as 10% off then 20% off.