"Was $299, now $149" is one of the most manipulated phrases in retail. Sometimes it's a genuine deal. Sometimes that item was never actually $299 anywhere, ever. The math for evaluating a discount is trivial — the real skill is knowing which "discounts" are worth doing the math on in the first place.
How Discounts Are Calculated
Sale price formula: Original Price × (1 - Discount%) = Sale Price. A $120 item at 25% off: $120 × 0.75 = $90. Savings amount: $120 × 0.25 = $30 saved. To find the discount percentage from prices: ($120 - $90) ÷ $120 × 100 = 25% off.
Comparing Different Deal Formats
30% off vs Buy 2 Get 1 Free: B2G1 on equal items = 33.3% off per item. So B2G1 beats 30% off. But: 40% off vs B2G1: 40% off wins. Use this: B2G1 = 33% effective discount. B3G1 = 25%. 10% off + free shipping vs 15% off + $8 shipping: depends on order size — calculate total cost.
💡 Always calculate the total out-of-pocket cost rather than the discount percentage. Shipping, taxes, and fees change the real price.
Finding the Original Price
If an item is on sale for $63 at 30% off, the original was: $63 ÷ (1 - 0.30) = $63 ÷ 0.70 = $90. Use this when: retailers show only the sale price, you need the pre-tax amount from a tax-inclusive total, or you want to verify the claimed savings.
How to Spot Fake Discounts
Red flags: prices that are always 'on sale,' reference prices significantly higher than competitors, 'was $299 now $149' tags that have been there for months. Per FTC rules, reference prices must reflect recent actual selling prices. Tactics: check price history on camelcamelcamel.com (Amazon), Google Shopping history, or simply compare with other retailers.
Quick Checklist
- Calculate total cost (including tax and shipping) before comparing deals
- B2G1 = 33% effective discount — compare against actual percentage discounts
- Use camelcamelcamel.com to verify Amazon price history
- Check that 'original' prices are real by comparing with other retailers
- Stacked discounts: 20% off then 10% off = 28% total, not 30%
For informational purposes only. Not financial, tax, or legal advice. Consult a qualified professional before making major decisions.