Quick help: simple calculation for a price with a discount in % in store
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The one-step method
Price with discount = (starting price) x (100 - discount in %)
Discount Multiplier Example price 100 CHF Final price -10% × 0.90 100 × 0.90 90 CHF -20% × 0.80 100 × 0.80 80 CHF -25% × 0.75 100 × 0.75 75 CHF -30% × 0.70 100 × 0.70 70 CHF -40% × 0.60 100 × 0.60 60 CHF -50% × 0.50 100 × 0.50 50 CHF -70% × 0.30 100 × 0.30 30 CHF 👉 Practical tip:
- With -10%, you multiply directly by 0.9
- With -20%, you multiply by 0.8
- With -25%, you multiply by 0.75
- With -50%, you multiply by 0.5
How do you calculate a discount as a percentage?
👉 Simple formula:
Example 1: a t-shirt at 50 CHF with -10%
- Initial price = 50 CHF
- Discount = 10% = 10 ÷ 100 = 0.10
- Calculation :
50 \times (1 – 0,10) = 50 \times 0,90 = 45 CHF
✅ The t-shirt costs 45 CHF after discount.
Example 2: Shoes at CHF 120 with -25%
- Initial price = 120 CHF
- Discount = 25% = 0.25
- Calculation :
120 \times (1 – 0,25) = 120 \times 0,75 = 90 CHF
✅ The shoes cost 90 CHF after discount.
Example 3: a bag costing 200 CHF with -40%
- Initial price = 200 CHF
- Discount = 40% = 0.40
- Calculation :
200 \times (1 – 0,40) = 200 \times 0,60 = 120 CHF
✅ The bag costs 120 CHF after discount.
💡 Quick tip without a formula:
- 10% = remove one-tenth of the price
- 20% = remove one fifth
- 50% = divide by two
- 25% = divide by four
