How do I calculate a percentage discount?
To find the sale price, multiply the original price by (1 − discount/100). For example, 20% off $80: 80 × (1 − 0.20) = 80 × 0.80 = $64. To find your savings, multiply the original price by the discount percentage: 80 × 0.20 = $16 saved.
How do I find the original price from a sale price?
Divide the sale price by (1 − discount/100). For example, if an item is $60 after a 25% discount: 60 ÷ (1 − 0.25) = 60 ÷ 0.75 = $80 original price.
What is the difference between discount and markdown?
A discount is typically a temporary price reduction, like a sale. A markdown is a permanent reduction in the retail price, often used when a product is being discontinued or is overstocked. Both are calculated the same way as a percentage of the original price.
How do I calculate two discounts stacked together?
Apply them sequentially, not additively. For example, 20% off then an extra 10% off: $100 → $80 (after 20%) → $72 (after 10% of $80). The combined discount is 28%, not 30%.