Question 1

How do I stack two discounts?

Accepted Answer

Apply them sequentially, not additively. A 20% then 10% discount on $100: $100 × 0.80 = $80, then $80 × 0.90 = $72 — not 30% off.

Question 2

What is the original price if the sale price is $68 after a 15% discount?

Accepted Answer

$68 / (1 − 0.15) = $68 / 0.85 = $80.

Question 3

How do I find the discount percentage when I know both prices?

Accepted Answer

Discount% = ((Original − Sale) / Original) × 100. E.g., ($80 − $68) / $80 × 100 = 15%.

Question 4

Is a "buy one get one 50% off" the same as 25% off both items?

Accepted Answer

Yes, mathematically equivalent when buying exactly two identical items.

Question 5

Does the calculator handle additional tax after discount?

Accepted Answer

Tax is applied to the sale price, not the original. Calculate the discounted price first, then multiply by (1 + tax rate).

Discount Calculator — Free Online Calculator