Discount Calculator
Shops say “30% off”; this tells you what you will actually pay and how much you keep in your pocket. Add a second discount to see how “an extra 20% off sale prices” really stacks up.
Answer
You save $24.00 (30% off).
Step by step
- 30% of $79.99 = 0.3 × 79.99 = $24.00 off.
- Sale price: $79.99 − $24.00 = $55.99.
Answer: $55.99
Still stuck? Ask the tutor about these steps
How it works
price × (1 − discount ÷ 100)(original − sale) ÷ original × 100Turn the discount into a decimal and multiply by the price to find the saving, then subtract. Or multiply straight by what you pay: 30% off means you pay 70%, so × 0.70.
Stacked discounts multiply. 30% off then an extra 20% off is 0.70 × 0.80 = 0.56 of the price — 44% off in total, not 50%.
Sales tax, if any, is normally added after the discount.
Worked example
A $79.99 jacket is 30% off. What do you pay?
- 0.30 × 79.99 = 24.00 off (rounded)
- 79.99 − 24.00 = $55.99
- Check: 79.99 × 0.70 = 55.99
Frequently asked questions
How do I calculate a percent-off price?
Multiply the original price by (100 − percent off) ÷ 100. For 25% off $40: 40 × 0.75 = $30.
Are two discounts the same as adding the percentages?
No. The second discount is taken from the already-reduced price, so 20% + 10% off is 28% off overall, not 30%.
How do I find the percentage discount?
Subtract the sale price from the original, divide by the original, and multiply by 100.