Money & Work
Enter the list price and the percent off. Add a second stacked discount (like a coupon on top of a sale) and your local sales tax rate to see the true final price — and exactly what you save. This is plain shopping math; no prices or retailer offers are listed or implied here.
A discount of p% leaves you paying (100 − p)% of the price: after = price × (1 − p ÷ 100). Stacked discounts multiply — they do not add. A second q% is taken off the already-reduced price, so the combined effect is 1 − (1 − p)(1 − q): 25% off followed by 10% off is not 35% off, it is 1 − 0.75 × 0.90 = 32.5% off. Tax, when entered, is applied last, on the discounted price — the way most registers ring it up.
Worked example: $100 at 25% off → $75. A further 10% coupon → $67.50. With 8% tax → $5.40 tax and a $72.90 final price. Total saved against list, before tax: $32.50 (an effective 32.5% off).
About the tax rate: rates vary by state, county, and city, and this page does not look yours up — enter the rate you expect to pay. Some places tax the full price when a manufacturer's coupon is used; store discounts are normally taxed after the reduction, as calculated here.
Why isn't 20% + 20% the same as 40% off? Because the second 20% is taken off the reduced price, not the original. $100 → $80 after the first, then $64 after the second — a 36% total saving, not 40%.
Does order matter when stacking? For the final price, no — multiplying by (1 − p) then (1 − q) gives the same answer either way around. What matters is that both apply to the price rather than to the tax or fees.
How do I do a quick mental 20% off? Find 10% (move the decimal one place left) and double it. 20% off $45 is $9 off, so $36.
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