How to Calculate Discount Percentage — 3 Simple Methods With Examples
Knowing how to calculate a discount is one of the most practical everyday math skills. Here are 3 simple methods for sale price, percent off, and reverse calculation — with real examples and a quick reference table.
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3 Types of Discount Calculations
Method 1: Find Sale Price (% Off a Price)
Formula: Sale Price = Original × (1 − Discount% ÷ 100)
Example: 30% off $85 → $85 × 0.70 = $59.50
Mental shortcut: Find 10% (move decimal left one place), then multiply. 30% off $85 → 10% = $8.50, 30% = $25.50, sale price = $59.50.
Method 2: Find What Percent Off (Two Known Prices)
Formula: Percent Off = (Original − Sale) ÷ Original × 100
Example: Original $80, sale price $56 → ($80−$56) ÷ $80 × 100 = 30% off
Method 3: Find Original Price (Reverse Calculation)
Formula: Original = Sale Price ÷ (1 − Discount% ÷ 100)
Example: $63 after 30% off → $63 ÷ 0.70 = $90 original price
Common Discount Quick Reference
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