Discount Calculator

Sale price math

Sale price = original × (1 − discount%). Amount saved = original − sale. Original = sale ÷ (1 − discount%). A $80 item at 25% off is $60. You save $20.

Worked example

A $80 jacket at 25% off is $60. You save $20. If the tag already shows $60 at 25% off, the original was $80.

Two discounts in a row usually multiply: 20% then 10% on $80 is $57.60, which is 28% off, not 30%. Ontario HST on the $60 sale price is $7.80, so the till shows $67.80. Add tax on the sale price, not on the original, unless the store taxes first (rare on retail receipts).

Watch the same example

The video walks through the $80 jacket in the example: one discount, tax at the till, two discounts in a row, and reversing a sale tag.

Common questions